Category Archives: Internet of things

MRF24J40 connection to Arduino

    Pin mapping: MRF Arduino GND 1 GND RESET 2 6 INTR 4 2 Interrupt 0 SDI 5 11 MOSI SCK 6 13 SCK SDO 7 12 MISO CS 8 7 VIN 10 3V3  

Logging 3 photo-resistors

  I have three photoresistors in my study that are measuring light coming from 3 directions and showing the live and historical data on the graphs below. How did I do it? Simple circuit.  Here is how the Arduino is hooked up.  (The resistors are 10k.) /* Simple test of the functionality of the photo… Read More »