IR transmitter troubleshooting

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1

Hello everyone, long time lurker first time poster here. I'm working on a simple project where I would like to copy IR remote and control an electric heater using UNO board and later esp8266. Long story short is, I cannot get the IR transmitter to work.

Project details

  1. Board used: UNO (clone). However have few of HiLetgo NodeMCU LUA ESP8266 if it helps with troubleshooting
  2. IDE used: IDE v2.2.1
  3. Library used: IRremote (4.2.0)
  4. Receiver/transmitter used: generic receiver/transmitter from the kit. Additionally removed an IR transmitter from the old tv remote for troubleshooting.
  5. Pinout: (+) pin 3 (-) gnd. I tried it both with resistor and without it.
  6. Problem:

Using the IRemote library example (SimpleReceiver) I detected all of the buttons in a following format

Protocol=PulseWidth Raw-Data=0x40D 11 bits LSB first
Send with: IrSender.sendPulseDistanceWidth(38, 1300, 400, 1300, 400, 450, 1250, 0x40D, 11, PROTOCOL_IS_LSB_FIRST, , );
Protocol=PulseWidth Repeat gap=6950us Raw-Data=0x40D 11 bits LSB first

After that I tried to use SimpleSender example to verify that captured data is actually correct and working. Nothing special in the setup() section other than:

pinMode(LED_BUILTIN, OUTPUT);
IrSender.begin(DISABLE_LED_FEEDBACK);

Then using the following line in the loop() section:

IrSender.sendPulseDistanceWidth(38, 1300, 400, 1300, 400, 450, 1250, 0x40D, 11, PROTOCOL_IS_LSB_FIRST, 170000, 0);

Makes the diode blink as expected (verified via phone camera), however there's no reaction from the appliance. Now I'm trying to figure out how to troubleshoot it further. Should I chase software or hardware issue.

Any suggestions would help!

2

Always show us a good schematic of your proposed circuit.
Show us good images of your ‘actual’ wiring.
Give links to components.

In the Arduino IDE, use Ctrl T or CMD T to format your code then copy the complete sketch.

Use the < CODE / > icon from the ‘posting menu’ to attach the copied sketch.

  • Two things, you must use an IR LED of the proper wavelength, you must be sure the protocol is the same as the receiving device.
3

In addition to IR wavelength and protocol, the transmitter IR modulation frequency must be the same as the receiver. Variations like 38, 40 and 50 kHz are common.

1 Like
4

Where are the 170000 and 0 come from?
Try more sensible values.

5

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