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I am looking for an experienced and talented engineer to create a PCB controller for a commercial HVAC system. I have a few general ideas on what the controller should be capable of, but need help fleshing out all of the details. This project will be fairly comprehensive and will require the designer to take their time and give it the attention it deserves. It will need to use the 24vac from the equipment and use the ESP32 as the brains.

A temperature PID controller that performs as a low limit protection using one input, one set point and one output as shall be detailed in a design brief document to be provided upon award and signing NDA. The device shall receive 24VAC power (available) and shall have a temperature sensor. The device will have no display, no buttons, no WIFI connectivity, and no memory to store history. The device does not need to communicate to a network or to the internet. it is a stand alone plug and play device. The device needs to have auto-tuning of the PID parameters to automatically change the parameters according to the response of the system it controls without the need to manually change the PID parameters by trial and error. The freelancer shall design the PCB, select the components...

A temperature PID controller that performs as a low limit protection using one input, one set point and one output as shall be detailed in a design brief document to be provided upon award and signing NDA. The device shall receive 24VAC power (available) and shall have a temperature sensor. The device will have no display, no buttons, no WIFI connectivity, and no memory to store history. The device does not need to communicate to a network or to the internet. it is a stand alone plug and play device. The device needs to have auto-tuning of the PID parameters to automatically change the parameters according to the response of the system it controls without the need to manually change the PID parameters by trial and error. The freelancer shall design the PCB, select the components...

...power connection. Board to contain programming logic to sequence the 6 solid state relays on the board that are powered from the board. On the output side of the solid state relays - 2 terminals each for +/- external device connection (rating for devices is 24VAC. Each external device will be maximum inrush current of 0.5A and normal operating current when programmed to be on 0.3 Amps. Programming (sheet attached) will be such that all 6 devices could come on at once and stay on at once so total inrush 3A and holding currents 1.8A. 24VAC power supply to be supply on the board to power these external devices once connected to the terminals. The unit should be able to be turned on using a remote control and one of 4 programs selected as per the program sheet. Also the ...

Need to have someone program arduino unor3 board to control 4 lights thru arduino 2 channel relays. 4 total channels. Convert 24vac input into feed for uno r3, then have relays cycle 1,2,3,4 then repeat1, 2, 3,4 indefinitely as long as uno r3 is get a signal converted 24vac signal. Possibly 1.5 minute durations for each relay.

Hi, I need freelancer who can make 3d models: 1st - 2nd - 3rd - 4th - 5th - I need freelancer who can make high quallity of this 3D model

...single output on each output Decoder with a switched relay output to power a 24V AC solenoid. See drawing attached to the project to explain further. Decoder The single channel Decoder output card needs to a decoder with a pre-allocated number (six digits preferable) with a common 24VAC on the input and output of the card, the 0V being switched by the relay. The relay card can have AC/DC bridge rectifier on it if the electronics need DC voltage to work. The switching load of the relay Decoder card will be 9W @ 24VAC. The Decoder unit will need flying leads for connection to the 2-wire and the load. Will confirm the PCB size, to be mounted in a little plastic box and resin filled. The same Decoder needs to work on both input options Encoder option 1 – 16-Channel in...

Hi, I need a schematic/PCB design that will convert 24VAC to 3.3VDC. AC/DC should be robust and be able to handle AC spikes and most important protect the 3.3VDC microcontroller/circuit. The system will be used in homes on the low voltage 24VAC. Design should be done in Altium.

1)To design a driver that decodes elevator position from different types of elevator controllers(binary,inverted binary), and sends that information serially with the minimum amount of wires possible(must be able to supply 40 units) ALL inputs will be universal to +24 to +48vdc/-24vac to -48vdc/120vac/240vac -0000000-1000000 latched inputs -Door open limit input -travel up input -travel down input -8 optional scrolling message inputs 2)To design a board that can be used universally on any elevator landing that decodes this information into a color screen with the floor indication. The screen will be able to display a 3 digit number and/or letters. This screen will show current floor and car travel direction. Each board will be addressable with dip switches. The arrival li...

. I am building a PCB board for a relay control that is 8.3cm x 4.0cm. I have a schematic ready to export and need it to rectify 24vac to 24vdc while controlling 110vac - 277 vac. attached is the schematic.

. I am building a PCB board for a relay control that is 8.3cm x 4.0cm. I have a schematic ready to export and need it to rectify 24vac to 24vdc while controlling 110vac - 277 vac. attached is the schematic.

CCTV - Not Working , Engineer will need to repair or replace camera Troubleshoot cause of problem. Check power to cameras. If no power, check fuse at power supply. If power is good, check video output of camera (use hand held monitor to test BNC output at camera). If no video, replace cameras. If there is video, check cable from camera back to DVR. Tes...DO NOT create a new hole and install in different location. Camera replacement must be in same location as existing, defective camera. Use J-box/gang box if necessary. Adjust view/focus. Confirm camera image on monitor with MOD or GSOC. REQUIRED TOOLS: Tamper proof Screw Driver set (variable sizes) Hand held Monitor (Analog BNC, Aux Video output test cable) Replacement cameras (Analog) 12VDC/24VAC dual voltage (if necessary) M...

...that will run in conjunction of a RPI Zero W. The RPI will be mounter on the PCB using the common 40 pin header. RPI Zero W will control other components found in the PCB to be designed. Here are the details of the PCB that needs to be designed. - Power supply from 120VAC and generate a 5VDC rail and a 24VAC rail to power RPI and other 5VDC and 24VAC components - Several (4 to 8) 5VDC controlled relays capable of driving 24VAC at low amparage(<1) - Several (2 to 6) 24VAC controlled contactor relays capable of driving 120VAC at about 20A - Some basic user interface though some switches/pins/push button - Some basic LEDs to be controlled by either RPI or other things - Console cable for CLI interface to RPI Zero More details will be prov...

...cheapest Color: Green preferred (cheaper better) Silkscreen: Top only (cheaper better) Order size: 10 PCB boards Intended Purpose: an open source I/O board based on the Arduino zero and raspberry pi zero W. No profits are being made from this project. Outputs: 6 channels 24VAC, 1 channel low voltage relay, 20K ohm Honeywell thermostat analog curve Each 24VAC channel must be able to support a 3 to 10 watt load Inputs: 6 channels 24VAC, 2 channels 3.3V 10K ohm thermistor Input channels are from any off the shelf 24VAC thermostat...

We have an industrial electronic product PCB and we need a power supply board .We have decided to keep the power supply input voltage as two option as INPUT 1)24VAC/DC Universal polarity insensitive -Option A 2)12VDC only - Option B OUTPUT 5v DC @ 2amp 3.3VDC @4 amps 12VDC @ 2Amps All outputs amps are concurrent load conditions high quality EMI/EMC compliant design best solution to fit in industrial as well as residential environment applicable in US,UK,EU and Australia overload output protection,overvoltage input protection and thermal shutdown needed. The powersupply board shall be suitable in high temperature rooms like 40 deg C as well as cold storage rooms like -10 deg C Shall work well up to 95% humidity environment. The power supply

...that has: - Arduino pro mini or or a more powerful version with more IO - Ethernet - Shift registers, - Bunch of LEDs, - Ability to sense bunch of 24VAC inputs - Solid state (triac perhaps) control of 24vac outputs. 3 wire configuration motors. Where #1 wire is common and the #2 one direction and #3 opposite direction. There are 2 wires coming from the motor with 24VAC output from #1 common wire upon motor reaching maximum rotation in each direction. - I need somewhere between 6~18 motor control circuits. - Need surface mounted fuses and swappable fuses for the motor outputs. - The board will be supplied about 6AMP of 24VAC and 5AMP 5VDC - Need LED's to visualize what is going on The layout needs to be made that it can fit multipl...

I want to design a circuit that uses a 4-20ma PID controller to control a DC motor. The available voltage I have for the circuit is 24VAC, and this is to output to a a 17VDC motor that has a maximum allowable current of 165mA. What I am looking for specifically is a circuit that can be made on a breadboard using simple and cheap, off the shelf components, that can control the motor as required, without damaging the low current 4-20mA controller and not using excess load from the 24VAC power supply.

...them I do not need. Here is the plugin modules. Below are my desired specifications: 1.) Female headers for my development board to be plugged in. 2.) Reset button, for programming purpose. 3.) Incoming power 24vac. On the 24vac incoming power connector, I want to have a filter protection circuit to filter any noise from incoming source. 4.) Triac controlled by opto isolator that can output 24vac with 2 wire connector each. If possible I want to create jumper settings on a board to convert the Digital output to digital input. Each digital output pins if have fuse should be better, with led. 5.) Digital input to accepts digital signal, if possible I want to have some protection from incoming

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I need a circuit that monitors a thermostat. The thermostat is a 24vac line. The input will go into the ADC of a digital IO pin of an arduino. The circuit should use a consume a tiny amount of power off of the 24vac line, just enough to monitor it. A the output will need to be probably high impedance and interface with whatever the digital IO pin of an arduino needs, current sync or current source. The output will need to b 0volts or 5volts and have conditioning so it's a nice clean signal. Thanks

I need a small board designed to assist with a current product. I have a product that requires 24VAC to operate, but due to line voltage variations and some internal circuit oscillations, the output high voltage varies widely. I would like a very small circuit board design that would do the following: 1. Accept 12-30VAC input at 500mA 2. The output automatically controlled based on circuit feedback (12-24VAC output required to drive my circuit/product at 500mA max) 3. Accept a feedback voltage from a high voltage DC circuit from my product that has a range from 2,000 to 12,000VDC by using a voltage divider (the HV output varies based on the 12-24VAC input voltage to my product). The HV current is less than 5mA 4. Take the voltage divider feedback for refer...

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NODE: 24VAC signaling --> Arduino --> RC servo pwm -OR- RS495 ModBUS --> Arduino --> RC servo pwm - 24VAC 60hz 40VA Power Supply - RS485 ModBUS RTU Protocol - Schematic - Coding - PCB Layout - Budget engineering - 32 total daisy chained nodes -300

I have a 240VAC -24V AC 144VA toroidal transformer. the 24VAC is fed into a 8 channel power splitter PTC fuse PCB . i need a low cost design and PCB Layout of a 8 Channel Bi Colour(Blue/Red) LED status PCB to monitor the state of each of the 8 PTC fuse. If the PTC is Closed cct (normal)status , LED will be Blue . a Fault(short or very low resistance) the Led will change to be Red . I already have a PCB size and on Protel File .

...board not PCB), 24Vac going to x2 metal probes (different lengths). Live should go through a separate Opto to each probe (the third and longest probe is neutral)... this is a water level sensor - hence the 3 different lengths. When a circuit is made once water bridges a live probe and neutral I want the associated opto to close and allow a 5Vdc output. I need x2 circuits with opto and separate 5Vdc output... one for "Water Level Low" and one for "Water Level High". I have the 24Vac and 5Vdc power supplies, so I just require the board (with components attached) made with facility to attach connecting wires... preferably screw-in terminal blocks of some sort and a diagram of what wires go where (I.E. +5Vdc from ps attaches here, 0Vdc goes here, +...

...or Reoccurring Monthly Purchases), the customer should be prompted to share on Facebook 6. The application in its most practical sense will need to authenticate with the database when a customer redeems a wash. What the developer will need to do is determine the best way to take a software input (one of the 4 redeemable wash packages) translated through the database and turn it into a 3 second 24VAC input signal which is needed to activate my car wash. Hardware specification is an absolute must. Phase 2 1. Additional App Purchases a. Rain Guarantee i. This feature will only be available to the customers that are utilizing the “Fixed Amount Purchases” ii. For a $1 buy up, the customer can purchase a 48 hour guarantee that if...

Design (and possibly provide prototype) of a circuit to detect low water level and activate a fill valve. Power input is 120v 60Hz AC, output to valve is 24VAC. Circuit would use a sensor that detects continuity between two contacts, using very low voltage/current so that it is intrinsically safe against electrocuting swimmers. Circuit would include an overfill lockout that would disable the fill function for 24 hours if low water level is sensed for more than 20 minutes. Circuit should include LEDs to inform user of functions (power, low water, fill valve, lock-out).

...status reports and accepts status changes via twitter, etc. Specs/functionality: 230vAC, up to 10 valves, up to 3 valves open at the same time, Valve has 24vAC max. 700 mA, NTP time, battery buffered RTC, RESET/STOP button, accepts impulses from electronic water meter and clock based run times reads precipitation forecast from API, reads rain rate from TXT file on remote web server, provides history / logging capabilities, reads/saves remote txt-schedule plans, etc. Preliminary Parts list: arduino board wifi (or ethernet shield with dd-wrt router) relay board (10 relays) 230vAC -> 24vAC transformer 24vAC to 10vDC converter momentary push button power switch LED state indicator built on breadboard housing case TBD 3 of 24v truck bulbs (for ...

...conductivity of water with upto 5000ppm of nacl. The circuit has source voltage of 5vDC or upto 24VAC and can be designed to output a signal to an atmel processor The probes are stainless steel spaced 1cm apart and will be used in apparatus to measure the conductivity of a water solution with a reading of 0-20000 ms/cm. For this reason several electrical characteristics must be taken into account. We would like the components to be simple and affordable as it will effect the base cost of the unit we are developing. Schematics will need to be provided as well as a description of how the circuit will work. In summary: a. Measure conductivity of water b. Source voltage on circuit will upto 24VAC c. Design needs to be simple and affordable d. Probes on meteri...

...would be less ideal. It would be absolutely fantastic if this would be a small, self contained device (like a relay in a box), and if it would operate fairly quietly. All suggestions much appreciated. Thanks in advance! For this project, the deliverables include _**hardware**_, to be delivered at a per unit price in the quantity (1 - 5) specified by buyer. Both transformers output 24VAC, 60Hz, max probably a couple of amps (standard HVAC transformers). 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist ...