Arduino uno eaglecông việc

điều khiển nước trong bình bằng 2 chế độ : - Chế độ 1 : sử dụng cảm biến siêu âm siêu âm chống nước để điều khiển nước theo chiều cao ( <10cm thì bơm chạy . bơm đến khi >40cm thì dừng và van điện từ hoạt động để xả nước ra ) -Chế độ 2 : sử dụng cảm biến mực chất lỏng để điều khiển ( 1 cái gắn bên trên, 1 cái gắn bên dưới ) . bơm nước đến khi cả 2 cảm biến đều có tín hiệu thì van điện từ hoạt động để xả nước ra * điều khiển bằng công tắc xoay 2 vị trí và hiển thị các thông số trên lcd như lưu lượng , chiều cao (khi dùng chế độ 1 ) , cảm biến nào hoạt động ( khi ở chế độ 2 )

Dùng arduino điều khiển động cơ step mở van nóng lạnh thông qua cảm biến nhiệt và nút cài đặt nhiệt độ theo mong muốn

Mình hiện tại có 1 hệ cân bằng gồm Arduino, servo, gear, thanh thẳng để banh. Mình đã hoàn thành và chạy tốt. Nhưng yêu cầu thêm là cần phần bản vẽ P&id nữa thôi. Hình bên dưới là bộ điều khiển PID. (nội dung job là so đồ P&ID).

thiết kế và lập trinh mạch arduino giao tiếp điều khiển với module sim

Thiết kế 1 websever để nhận và gửi dữ liệu từ cảm biến esp32. các tín hiệu thông qua mạng wifi hoặc blutooth. Đầu đọc chất lượng nước theo như thông số cảm biến nhưng tín hiệu đưa về là vôn, tín hiệu xuất ra như của cảm ...nước theo như thông số cảm biến nhưng tín hiệu đưa về là vôn, tín hiệu xuất ra như của cảm biến " phần này là cảm biến có sẵn đơn vị, chỉ có đổi đơn vị đầu vào thành vôn". thiết kế mạch EC meter qua chương trình Orcad hoặc Proteus. In mạch EC metter. Cảm biến TDS "EC Metter" ...

Thực hiện sợ đồ, gia công sản phẩm có sẵn, thêm tính năng xoay 180 độ cho sản phẩm nhờ servo!

Tự động hoá nhà nuôi yến. Yêu cầu 1 hệ thống tự động, điều khiển từ xa thông qua kết nối internet, hoạt động trên 1 PC (kết hợp Arduino). - Hệ thống hoạt động trên nguồn điện DC 12v. - Output 3 lines âm thanh độc lập + 3 amplifiers. - Đo nhiệt độ và độ ẩm. Output: DC brushless pump. - Giám sát bằng camera, sensor báo động đột nhập. - 3 ngõ Output khiển tích hợp timer: bơm hơi, đèn, quạt. Bạn thạm gia dự án có thể chọn 2 phương án: giá thầu tổng hoặc chỉ thi công (vật tư dự án cung cấp)

Sử dụng cánh tay 3D vẽ theo mẫu có sẵn , in 3d Sử dụng Arduino Mega 2560 + Ramps 1.4 shield Hiện đã có mô hình

...pueda ayudar a generar historias y relatos. Requisitos: * Tener experiencia en la creación de contenido, especialmente en la creación de historias y relatos en el género de ciencia ficción, especialmente con temas que giran en torno a escenarios apocalípticos, post-apocalípticos y Distópicos, mostrando el lado más crudo y oscuro de estos. * Crear historias de aproximadamente 2.000 palabras cada uno, siguiendo las pautas temáticas proporcionadas. * Tener una excelente redacción. * Garantizar que el contenido sea original y pase los controles de plagio. * Colaborar estrechamente conmigo para cualquier revisión o ajuste temático necesario. Es un proyecto a largo plazo y se ofrece $5 USD por histori...

Se necesita en autodesk fusion 360 o rhinoceros que una carrocería de maqueta sea modificada: Se parte de una carrocería en formato STL. Se necesitan modificaciones del tipo: -Añadier machihembrado para que distintas partes separadas se puedan unir (como retrovisores, alerones o espejo). -Eliminar ciertas partes. -Reducir grosores para igualarlos. -Modificar ciertas pa...rhinoceros que una carrocería de maqueta sea modificada: Se parte de una carrocería en formato STL. Se necesitan modificaciones del tipo: -Añadier machihembrado para que distintas partes separadas se puedan unir (como retrovisores, alerones o espejo). -Eliminar ciertas partes. -Reducir grosores para igualarlos. -Modificar ciertas partes (aumentar curvas, sustituir dos t...

Crear 3 videos de 15 segundo cada uno basado en los guiones que adjunto a continuación debe ser impactante y se necesita con urgencia el pago es de 20 dólares totales

Crear 3 videos de 15 segundo cada uno basado en los guiones que adjunto a continuación debe ser impactante y se necesita con urgencia el pago es de 20 dólares totales

I'm seeking a talented logo designer with a strong portfolio and a passion for animal welfare. My non-profit, Orange Umbrella Rescue, is in need...Umbrella Rescue, is in need of a new logo. Key Requirements: - I want the logo to convey feelings of compassion and hope, reflecting the core values of our organization. - The color palette should predominantly include orange and black. - The design should be professional and clearly represent our work in animal rescue. It should have an orange umbrella + illustrated images of animals. Dog, cat, eagle, fox etc I'm looking for a designer who can take my vision and create a beautiful, impactful logo that will help us stand out as a non-profit. Experience in non-profit branding and a solid understanding of color psychology would...

I have been developing a arduino type hmi using a nextion touch screen, arduino mega, arduino nano esp32 for wireless control and a waveshare esp32 touchscreen for the remote. I have written all the code but am needing help figuring out why the commands are not working as they should.

...in need of a talented designer who can create a custom case for a digital stop watch that will primarily be used for sports timing. Key Requirements: - The case should have an ergonomic grip, similar to that of a Seiko S141. This is crucial for comfortable handling during sports activities. - The design must be compatible with micro boards, a battery, and an OLED display. I would like to use Arduino pro micro and a small 1.5" display Ideal Skills and Experience: - Proficiency in product design and CAD software to develop the case model. - Prior experience in designing sports equipment is highly preferred, to ensure the final product meets the specific requirements for this kind of usage. - Knowledge of materials to be used in manufacturing for both durability and comfort. ...

I am in need of a skilled Arduino programmer, with experience specifically in robotics programming for educational purposes. The project has an intermediate level of complexity, so a solid understanding and the ability to problem-solve and code efficiently will be crucial. Ideal Skills: - Arduino programming - Robotics programming - Educators and student-user centered design Given the nature of the end-users, it would be highly beneficial if the freelancer also has experience in creating user-friendly interfaces and can foresee potential challenges that educators or students may face. Your technical expertise will be expected to translate into an accessible and engaging project that fits the educational context.

I'm seeking an experienced Arduino developer with a strong background in SNMP integration to assist with my IoT project. While I haven't detailed the specific tasks for the Arduino sketch, I need someone who is able to create a comprehensive program that meets the needs of my project.

I am seeking talented freelancers to develop an Arduino UNO bluetooth car for my personal hobby project. It requires expertise in Arduino programming and physical assembly of the car kit. The specific features I want are: - Directional movement: The car should smoothly move forward, backward, left, and right via remote bluetooth controls. - Speed control: The speed of the car should be adjustable. The ideal size I'm seeking for the car is medium, neither too compact nor too large. Experience with remote control vehicles and Arduino, as well as understanding of bluetooth technology, will be a plus for this project. I am looking forward to your innovative design submissions and technical solutions.

I'm in need of an experienced programmer who is well-versed in Arduino code. This project demands a particular set of skills: * Proficient in Arduino coding with a focus on device communication. * Comprehensive understanding of stepper motors functionality and their interaction with Arduino. * Ability to program Arduino to communicate and effectively control two stepper motors. The delivered coding should achieve seamless communication between Arduino and the stepper motors. Please take note of the quantity of stepper motors to control - two in this instance. Qualified bidders will be well-experienced in Arduino and stepper motors, able to discuss technical requirements with clarity, and pride themselves in delivering accurate, reliable cod...

...you were to pass the second logic test, and $50 (Fifty Dollars) if you were to pass the third logic test. ✻ OBTAINING SUPPLIES ✻ I will send you approximately $50 (Fifty Dollars) so that you can purchase ESP32 development boards, breadboards, components (such as resistors, transistors, and capacitors), wires, etc. on a site such as AliExpress, Mercado Libre, etc. The ESP32 is similar to an Arduino. I realize it may take you up to 30 (thirty) days to obtain these items. That's fine with me. However, I will * not * help you deal with corrupt local customs officials who require bribes to release goods. Any “horror stories” you might have heard or read about corrupt local customs officials in your country requiring bribes to release goods probably were for item...

I'm looking for a skilled ...coordinates in a temperory queue and Send them every 5 Sec. 5. Along with GPS also send Speed information. // Push coordinates API contract Data Structure :- <TrackerId> : { coords: [ { loc: [<lat>,<long>], Speed: 14 }, ... ] } Result : 1. Steps to deploy code to A9G module 2. How to change GPS coordinates recording frequency Ideal Skills: - Arduino Developer - Understanding of developing custom GPS tracking solutions - Experienced with the Ai-Thinker A9G GPS/GPRS module - Strong understanding of real-time tracking and speed measurement technologies - Excellent problem-solving skills for effective communication method implementation. If you have the necessary skills and...

Bald Eagle, Magpie, Golden Pheasant, Crow, Cracked egg phases.

IOT is being used a lot these days to provide functions that were being done before manually. We are also embarking on the same journey and looking for a potential person who can help us with our proposed system. Thank you

...en finanzas/economía. Preferiblemente una maestría en Finanzas. Se precisa a un/a redactor/a para redactar textos añadiendo explicaciones sobre conceptos como tasas interés, inflación, bonos del tesoro, etc. con un lenguaje coloquial para que lo pueda entender cualquier persona. Disponibilidad de 4 horas al día. Hay un proceso para su creación que se explicará. Serán 3-4 textos a la semana. Cada uno tiene un coste de 25$ y se entregará en 24h. Temas de ejemplo (POR FAVOR, SI NO DOMINAS ESTOS TEMAS, NO TE INSCRIBAS. Todos los temas son relativos a estados unidos): -Que son los bonos del tesoro, la inflación y cómo está relacionado y como afecta a una persona común. -Que es el sp500...

...ventas telefónicas (Setter), preferiblemente en el sector de finca raíz. Habilidades excepcionales de comunicación y persuasión. Capacidad para trabajar de forma independiente y cumplir con los objetivos de la venta (Agendar visitas efectivas). Disponibilidad para trabajar en un horario flexible. Hablar ESPAÑOL Beneficios: Oportunidad de trabajar en un entorno dinámico y emocionante enfocado en uno de los destinos más bellos de Colombia. Incentivo especial por el cumplimiento del objetivo de la venta Posibilidad de crecimiento y desarrollo profesional futuro ¿Interesado en unirte a nuestro equipo? Si cumples con los requisitos y estás list@ para asumir este desafío, ¡esperamos con ansias recibir tu pr...

...Currently the design uses a TTL connection for uploading firmware Your tasks will include: - Understanding the project requirements and goals - Make necessary updates to design files - Assist software (firmware) team in loading/executing firmware (Arduino IDE) - Designing a multi-layer PCB layout that meets the specified criteria - Ensuring that the board is optimized for the intended use as a prototype - Providing necessary documentation for manufacturing and assembly Ideal Skills and Experience: - Proficient in PCB design software (such as Eagle, Altium, KiCad) - Experience with multi-layer board design - Familiarity with microcontrollers, ePaper displays, and power management systems - Strong communication and collaboration skills - Previous experience in prototyping...

...ventas telefónicas (Setter), preferiblemente en el sector de finca raíz. Habilidades excepcionales de comunicación y persuasión. Capacidad para trabajar de forma independiente y cumplir con los objetivos de la venta (Agendar visitas efectivas). Disponibilidad para trabajar en un horario flexible. Hablar ESPAÑOL Beneficios: Oportunidad de trabajar en un entorno dinámico y emocionante enfocado en uno de los destinos más bellos de Colombia. Incentivo especial por el cumplimiento del objetivo de la venta Posibilidad de crecimiento y desarrollo profesional futuro ¿Interesado en unirte a nuestro equipo? Si cumples con los requisitos y estás list@ para asumir este desafío, ¡esperamos con ansias recibir tu pr...

As a developer with experience in MKS DLC32 (Arduino code), I am looking for a solution to gain precise control over a 5-volt water pumps and a servo connected to an MKS dlc32 board. the code should be written in Arduino Ide as custom script. Key Features: - Controlling stepper motors (already have that) - Regulating a 5-volt water pump - Manipulating a servo The success of this project relies heavily on achieving precise control over the afore mentioned devices. Given the technical requirements for this job, it's beneficial if you have a relevant background and an understanding of how to efficiently work with MKS DlC32 board. Ideal Skills and Experience: - Extensive experience with Arduino IDE - Specific knowledge of MKS dlc32 boards - Proven ability in d...

I require an intricate hardware developer with technical mastery to custom design an isolated encoder signal splitter board that's compatible with Arduino micro-controller, specifically ATmega2560. Key Features: 1. Voltage Isolation: The board must feature voltage isolation to ensure safe transmissions. 2. Compatibility: It must be fully interoperable with Arduino libraries which serves as a platform for expansion and experimentation. 3. Signal Amplification: the board should not draw more current than pull-up resistors for incremental encoders connection. If required, a signal amplification needs to be implemented. Standard signal voltage is 5V DC. Main Purpose: 1. Noise Reduction: It should provide clear communication by suppressing ambient noise in the signal. The...

Change the position of CC1101 and then change the size of the enclosure

...siguiente: 1. Estudiar guía proporcionada por nosotros, comprender lo que se requiere mencionar y lo que se requiere cotizar, tener comunicación con nosotros por este medio antes de iniciar la actividad para aclarar el objetivo y resolver cualquier duda. (Tiempo aproximado 1 hora, de la cual son 30 minutos de estudio de guía y 30 minutos para resolver dudas). 2. Acudir de manera presencial a cada uno de los cinco negocios asignados. (Tiempo aproximado 5 horas: 30 minutos en cada negocio + 30 minutos de tiempo de traslado a cada negocio) 3. Enviarnos las cotizaciones recibidas por correo electrónico y un cuestionario de evaluación por cada negocio (Tiempo aproximado 3 horas: 30 minutos por cada negocio). En total se requieren de aproximadamente...

As the project owner, I require an Arduino Uno code, specifically designed to interact with a fingerprint reader for input, LCD and 14 relays for output. Key Requirements: - The code should identify 14 people's fingerprints (let's say 2 different fingerprints for each person), write the name of that person on the LCD and activate the corresponding relay for each person. - The associated relays will control a particular robotic device. - When an unrecognized fingerprint is scanned, the system should write on LCD "unrecognized fingerprint" without triggering any relay. Ideal Skills and Experience: - Proficiency with Arduino programming - Experience working with fingerprint readers - Knowledge of relay and robotic systems . Familiarity with sensor...

I have a project that requires setting up an 8 Channel Arduino Relay Module and programming it to operate using a basic 4 button hand controller. My Arduino board of choice is the Arduino Uno. For the hand controller, I need different functionalities: - Each button should be able to toggle a specific relay on and off. - Certain buttons should cycle through a sequence of relays. - Some buttons should have the ability to control a combination of relays. Importantly, only 1 relay should be controlled at a time. The ideal freelancer for this project should have a deep understanding of Arduino programming, particularly with Arduino Uno, and experience with relay modules and controller setup. Familiarity with creating flexible, customizable c...

Here is a brief description of my project. (Please note: I will not reply back to auto response messages. Also please post the actual price not a price just to get my attention.) My project consists of two items. Part A: Part A has a single function that function is to transmit a signal. The part needs to be housed in a waterproof container and be powered by a rechargeable battery preferably through USB. This part will actually go on a dogs collar. The device can either transmit vi. RF, USB or any other short range signal. Part B: Part B its job is to have two functions. The first function is to receive a signal from Part A, the second job of Part B is to transmit a specified RF signal to Part C when Part A is within 2 to 3 feet of Part B. Part B, needs to also be housed in a waterproof...

...individual to create an innovative IoT solution utilizing an Arduino board and camera module, along with UPC scanning software. This project involves developing a UPC scanner that can accurately read the UPC on a product. Upon scanning, the information of the scanned product such as date, time, UPC, product name and product retail should be transmitted and populated into a web application. Key Tasks: - Develop and integrate the UPC scanning software to be used with the camera attachment for the Arduino board. - Establish a Wi-Fi connection for the Arduino IoT UPC scanner to communicate with the web app. - Ensure accurate transmission and population of the scanned product information in the web application. Ideal Skills: - Proficient in Arduino programming a...

I'm in need of a unique logo that will primarily be used for marketing and advertising purposes, both online and in print. Key Details: - Guard Auto Detailing - Main color yellow, white and black - Eagle mascot - It should be versatile enough to adapt to various marketing materials and platforms. Ideal Skills: - Strong graphic design and branding experience. - Ability to create versatile logos suitable for both online and print. - Understanding of how to evoke specific emotions through design.

I need an expert in Arduino programming to develop a code that connects to an OV7670 camera, recognizes specific patterns (like a person's head) and triggers an LED. Key Requirements: - Use an Arduino Uno or Nano to interface with an OV7670 camera and LED. - The code should have a pattern recognition feature - specifically, recognizing a person's head. - When the pattern is detected, the LED should light up to indicate an event has occurred. Additional Details: - The code should be able to differentiate a specific pattern (a person's head) from other objects or patterns that may be in the camera's view. - This is an intermediate level project, hence the recognition should be accurate enough to detect the specific object. Ideal Skills: - Proficien...

Написати код для проекту розробка системи контролю мікроклімату на базі arduino leonardo (є також UNO) в середовищі Arduino IDE Макет буде у коробці у якій треба буде продемонструвати роботу. Треба щоб на екрані відображалась поточна температура та також можливість встановлювати температуру через джойстик. Треба щоб значення температури регулювалась через PID-регулятор (програмно) для того щоб пристрої охолодження та нагріву змінювали потужність плавно в залежності від поточної температи. Список датчиків та деталей: 1. Датчик вологості та температури DHT11 (Є також bme 280) 2. Датчик газу MQ2 3. LCD1602 з i2c 4. Джойстик для ардуіно 5. Вентилятор 5v або 12v - для охолодження повітря (такий який в ПК встановлюється) 6. Нагрівальний елемент – лампа накалюв...

Advise as to whether vs code or arduino ide would be more suitable Complete a project containing the various pages of code, organised and zipped, ready for unpacking and modification/use. //* comment heavily, briefly explaining the features as you go. Use caps lock for anything that requires editor attention or input. Intended for hardware devices: • Xiao Esp32-S3 Sense (I call 'sense') • a small bulb such as this: • ESP32-4848S040C_I_Y_3 (I call '484') • a small speaker, such as this: Each sense should be assigned the placeholder for 2 micro servos. So if a new sense is selected via the 484 at any time, it is assigned a light as well as 2 servos. No functionality is currently required of the servos but the coding should

I need help to build a library for the tmp1827 (Texas Instruments) onewire sensor in arduino. It should run also with an ESP32. The Library should have at least following methods: Read temperature Read unique ID Write EPROM Read EPROM

I am in need of a professional who can efficiently handle an RS485 device that requires reconfiguration. The scope of...converter - Installation and configuration of the converter with the RS485 device - Ensuring smooth and effective communication between the RS485 device and the TCP/IP Ethernet serial server Preferred skills and experience: - Proficient in working with RS485 devices - Strong knowledge of TCP/IP Ethernet serial servers and hardware programming - Prior experience with Modbus TCP - Familiarity with Arduino, Raspberry Pi, and ESP8266 Your responsibility will strictly be focused on setup and reconfiguration; no modifications on the RS485 device will be necessary. Please only bid if you are confident with this job, have relevant experience, and can deliver the projec...

...background in measurement systems particularly using load cells and load cell amps and basic platform development. The objective is to develop a project which measures loads within a range of 10-20kg , with data input to an Arduino microcontroller. The ability to configure an edge device to continuously stream data to a simple BI dashboard on a desktop is also required. The successful freelancer should have the following skills and experience: - An excellent understanding of load cells and how to operate and interpret readings from them. - Extensive experience using Arduino microcontrollers and able to proficiently program and troubleshoot them. - Knowledge on how to integrate an edge device with this setup, and the skills needed to stream data to a BI dashboard. -Should...

Hi there, I'm looking for an expert in Arduino programming who can develop custom code. I have all the hardware including an Arduino Uno R4, a NEMA 17 stepper motor, an A4988 stepper motor controller, an RC522 RFID antenna, a 1602IIC LCD display, and push buttons. All of these components need to be connected to the same arduino. I need this system function as follows: - When the push button is pressed, the stepper motor will be moved X amount of steps in one direction after a delay of 1 second. At this time, the LCD display should display "Scan ID to Unlock". - When a registered and accepted RFID tag is scanned, the LCD will display "Tool Unlocked". When this happens, the stepper motor should be moved X amount of steps BACK to where...

Tengo un proyecto para uno de mis clientes que implica la creación de un nombre para una marca. Estamos buscando desarrollar una marca de snacks saludables que sea atractiva, creativa, memorable y que transmita el mensaje deseado por el cliente. Es fundamental que el nombre sea único y cumpla con los requisitos para su registro tanto en México como en Estados Unidos tanto fonética como figurativamente, donde también planeamos comercializar la marca próximamente. Indispensable comprobar experiencia previa, metodologías de investigación y de entrega de proyecto final. Saludos y a sus ordenes.

I'm in need of an ESP32 BLE application that can be controlled remotely. The platform for the user interaction will be Arduino ESP32. Key Requirements: - Client/Server Architecture: This application should have a client/server structure. - Bidirectional Communication: The application should support both reading and writing data. - Multiple Device Control: The application should be capable of controlling between 1-5 different devices. The ideal freelancer for this project should have: - Strong experience with ESP32 and Bluetooth Low Energy. - Proficiency in developing applications for Arduino ESP32. - Proven track record of building client/server applications. - Excellent communication skills to understand the specific requirements of this project.

La ides es poder generar un proceso RPa semiasistido que permita entrar a una URL y ahi para porque tiene catchap, el usuario verificar el catchap y el proceso se activa. Para eso antes debe salir un cuadro con las opciones que se necesitan donde el usuario solo coloca numero de documento que debe ser...catchap, el usuario verificar el catchap y el proceso se activa. Para eso antes debe salir un cuadro con las opciones que se necesitan donde el usuario solo coloca numero de documento que debe ser usado en una url especifica para buscarlo y guardarlo y luego continuar el proceso de carga de informacion en el site donde se debe enviar el documento previamente descrito. Este proceso no es masivo. Es uno a uno. Tal vez puede pasar que se repita porque hay que enviar a varios barr...

Aspetti Medici e Terapeutici Uno dei settori più discussi riguarda gli effetti medici della cannabis. Gli studi scientifici hanno dimostrato che alcuni composti presenti nella pianta, in particolare il THC (tetraidrocannabinolo) e il CBD (cannabidiolo), possono avere effetti benefici su una serie di condizioni mediche, tra cui dolore cronico, nausea, disturbi dell'umore e spasmi muscolari associati a patologie come la sclerosi multipla. Tuttavia, l'efficacia e la sicurezza del suo impiego terapeutico sono ancora oggetto di dibattito e ricerca. La cannabis è al centro di intense dispute legali e politiche in molti paesi. Mentre in alcuni Stati è stata legalizzata per l'uso medico e/o ricreativo, in altri rimane illegale o soggetta a restrizioni se...

I'm in need of a skilled Arduino coder to create a custom code for me. My project primarily involves generating variable frequency range FSK sine wave output. Key Requirements: - Develop code specifically for Arduino R4 board + SD card module - Generate sine waves of different frequencies - Different frequencies - 10,000 different frequencies (integers) - eg: txt file (100,200,300,400,500.................n integers) Frequencies list are stored in a SD card CSV or txt format Arduino new R4 boards has built-in DAC for sine wave generation with ready made library as follows: Code for wave generation --->>> analogWave wave(DAC); int freq = 10; // in hertz, change accordingly void setup()...

Somos una consultora IT en busca de un formador para uno de nuestros clientes. La formación que busca nuestro cliente seria la siguiente. Objetivo -> conocimiento de software TIBCO Spotfire (plataforma de análisis que permite transformar los datos en información potente, de manera rápida e intuitiva. Transformar y manipular datos, empezando con un acceso rápido y conveniente des de archivos, bases de datos, servicios web, API o servidor. Obtener información fácil de interpretar para detectar tendencias y patrones. -Contenidos -> Overview SF104 (2a parte del General End User Spotfire) 1. Transform and manipulate data 2. Create bookmarks, tags, and lists 3. Expand into more visualizations