I recently bought 4 Nrf24L01 modules, 2 small modules with internal antenna and 2 bigger ones with a preamp, amp and external antenna. You can find the small modules for less then 5$ a piece on Ebay. It’s the cheapest way make a wireless connection between 2 Arduino’s. These modules are based one the Nordic […]
By connecting a DHT22 temperature and humidity sensor, a DS1307 RTC module and an SD card module to the Arduino Mega 2560 we can make a data logging system. The DHT22 sensor measures the temperature, the DS1307 gives us the date and time and this data is then written to the SD card over the […]
This time I have written a sketch to control a light with a PIR detector, well in this case the light is just a led. When the PIR detector detects movement it turns on the light, and after 30 seconds the light goes out. This is a common circuit in home automation, some of these […]