Mcu 0139-remote-433MHz-transmitter

Home automation project sending telemetry using a low-cost ISM-band (433MHz) transmitter.

This is a change of plan from what I originally intended to use (the RFM69HW modules), but with several home automation solutions easily available I decided to make use of these modules instead.

This is the bare transmitter module.

Here is the transmitter module wrapped in heatshrink and stuck on top of an Arduino Nano

Making the overall form factor even smaller by contemplating putting it on a Digispark board.

The benefit is that the ATtiny85 modules are fairly cheap and can hold up to 8kB of program memory. A quarter the size of the ATMega328 Arduino but probably still more than enough to send some telemetry.

This is the module fitted onto a custom PCB that has the ATtiny85 on the underside.

Bill of materials (PCB v1.3):

• H34A transmitter module

• ATtiny85 SOIC