Is it possible to use a W5100 shield on a Mega2560 that has a prototype shield on top? I am not sure, because the ICSP headers are moved in a corner of the proto shield.
RF Nano = Nano + NRF24, for just $3,50 on Aliexpress
UART or I2C sensor version?
A small NRF24L01 chip comparison
Seeking advice on RF set up
MySensors shield and RGBW Controller
[SOLVED] Poor battery life on door sensor
Would it be possible to run the MAX4466 with battery?