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MicroPython YS-RF34T 433MHz ASK/OOK UART Transceiver

MicroPython examples using YS-RF34T 433MHz ASK/OOK UART transceivers.

demo

This module consists of an unlabelled MCU that provides a UART interface to two daughter ASK/OOK modules.

A 433MHz receiver (YS-RF470) and a 433MHz transmitter (H34C).

This module can be used to emulate or program a ASK/OOK based fixed code remotes.

Does not support rolling code.

Examples

from machine import Pin, UART
uart = UART(1, tx=14, rx=15, baudrate=9600)

# sniff for a remote
def sniff():
    while True:
        if uart.any():
            print(uart.readline())

# eg. received b'\xfd\x84\x19\x04D\xdf'

# replay a remote
def replay():
    # almost the same buf as received
    # byte 1 is how long to tx for
    uart.write(bytearray(b'\xfd\x03\x84\x19\x04D\xdf'))

# transmit
def tx(addr, key, time=3, width=64):
	buf = bytearray(b'\xfd\x00\x00\x00\x00\x00\xdf')
	buf[1] = time & 0xff
	buf[2] = (addr >> 8) & 0xff
	buf[3] = addr & 0xff
	buf[4] = width & 0xff
	uart.write(buf)

# (0x84 << 8) | 0x19 = 33817
tx(33817, 4)

# receive
def rx():
    while True:
        if uart.any():
            buf = uart.readline()
            if len(buf) == 6 and buf[0] == 0xfd and buf[5] == 0xdf:
                addr = (buf[1] << 8) | buf[2]
                key = buf[3]
                print('Found! Address: {}, Key: {}'.format(addr,key))

rx()
# Found! Address: 33817, Key: 1
# Found! Address: 33817, Key: 2
# Found! Address: 33817, Key: 4
# Found! Address: 33817, Key: 8

The MCU understands 2262, 2260, 1527 encoded transmissions.

If you're not receiving anything, check your RX and TX are not switched otherwise the remote might be using an unsupported protocol.

Pinout

Pin Name Description
1 GND Ground
2 RXD UART receive
3 TXD UART transmit
4 VCC Supply voltage 3V3 - 5V

Connections

TinyPICO ESP32

from machine import Pin, UART
uart = UART(1, tx=14, rx=15, baudrate=9600)
YS-RF34T TinyPICO (ESP32)
GND GND
RXD 14 TXD
TXD 15 RXD
VCC 3V3

Transmit Protocol

Write 7 bytes and the MCU will build and send out the desired packet using the onboard ASK/OOK RF module.

Packet = (Header, Time, Address 2, Address 1, Key, Width, Footer), eg.

byte name description
0 header constant value of 0xFD
1 time transmit time - signal repeats until timeout
2 addr2 high address bits
3 addr1 low address bits
4 key which button was pressed
5 width width of signal in ms
6 footer constant value of 0xDF
header time addr2 addr1 key width footer eg
0xFD 0x03 0x84 0x19 0x04 0x40 0xDF b'\xfd\x03\x84\x19\x04\x40\xdf'
0xFD 0x06 0x22 0x33 0x44 0x50 0xDF b'\xfd\x06\x22\x33\x44\x50\xdf'

Receive Protocol

When the MCU receives a signal from the receiving ASK/OOK RF module, it will output 6 bytes over UART.

The packet is almost identical to the TX packet, only is missing the Time value.

byte name description
0 header constant value of 0xFD
1 addr2 high address bits
2 addr1 low address bits
3 key which button was pressed
4 width width of signal in ms
5 footer constant value of 0xDF
header addr2 addr1 key width footer eg
0xFD 0x84 0x19 0x04 0x44 0xDF b'\xfd\x84\x19\x04\x44\xdf'

RTL-SDR capture with URH and replay with YS-RF34T

See RTL-SDR-URH.md.

Parts

Links

License

Licensed under the MIT License.

Copyright (c) 2019 Mike Causer