ET-S72
IR Remote Receiver + Transmitter
Learn and send TV / AC remote codes, 38 kHz
AED 22.00
Out of stockOverview
Learn and send TV / AC remote codes, 38 kHz
The ET-S72 is built around the Everlight IRM-H638T 38kHz, NEC / RC5 / Sony and most TV remotes. It connects over RX digital out (active low) (TX logic in (carrier from the MCU)) and is powered from 3.3–5V.
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- Home Assistant IR blasters
- Control old TVs and ACs
- IR remotes for projects
Key features
What makes it different
Receiver
Everlight IRM-H638T 38kHz, NEC / RC5 / Sony and most TV remotes
Transmitter
5mm 940nm IR LED (ships loose) switched by an N-MOSFET, ~160mA peak at 5V
Interface
RX digital out (active low), TX logic in (carrier from the MCU)
Supply
3.3–5V
Open documentation
Schematic, BOM and layout notes published for every board.
Breadboard friendly
Standard 2.54 mm pitch and M2.5 mounting holes.
Specifications
Technical specifications
| Receiver | Everlight IRM-H638T 38kHz, NEC / RC5 / Sony and most TV remotes |
|---|---|
| Transmitter | 5mm 940nm IR LED (ships loose) switched by an N-MOSFET, ~160mA peak at 5V |
| Interface | RX digital out (active low), TX logic in (carrier from the MCU) |
| Supply | 3.3–5V |
| Size | 25.4 × 17.8 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 4-pin 2.54 mm header |
| Main IC | IRM-H638T/TR2 (LCSC C91447) |
| Revision | Rev A |
| Libraries | IRremote / IRremoteESP8266, ESPHome remote_receiver + remote_transmitter, Linux LIRC |
|---|
Performance
Range
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VIN | Power | 3.3–5V |
| 2 | GND | Ground | Ground |
| 3 | RX | UART | Demodulated IR, active low |
| 4 | TX | UART | Drive with 38kHz carrier (PWM / RMT) |
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-S72 IR Remote Receiver + Transmitter (assembled)
- 1 × 4-pin 2.54 mm male header, unsoldered
- 1 × 5mm 940nm IR LED (ships loose, solder yourself)
Getting started
- Wire the header: VIN, GND, RX, TX
- Libraries: IRremote / IRremoteESP8266, ESPHome
remote_receiver+remote_transmitter, Linux LIRC
Compare
Which simple sensor?
| IR Remote Receiver + Transmitter (this board)This board | ET-S71 5-Channel IR Line Sensor | ET-S74 DRV5032 Magnetic Door Switch | ET-S75 Water Leak / Rain Detector | |
|---|---|---|---|---|
| What it does | Learn and send TV / AC remote codes, 38 kHz | 5 reflective IR sensors with analog outputs and emitter enable | Ultra-low-power Hall switch for doors and lids | Gold-plated probe with adjustable digital and analog outputs |
| Interface | RX digital out (active low), TX logic in (carrier… | 5 analog outputs (use ADC pins) + emitter enable | Push-pull digital out, low with magnet | — |
| Best for | Home Assistant IR blasters | Line-following robots | Door and window sensors | Leak alerts under sinks and heaters |
| Price | 22 AED | 29 AED | 12 AED | 15 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.