Solar Peltier Mini Air Conditioner Experiment
Testing a Peltier cooler with a 100W solar panel using two BME280 sensors, an ESP8266, a DS18B20 temperature sensor and Google Charts I’ve had an interest in thermoelectric…
Electronics
5A Lithium MPPT Solar Charger – Set Up Instructions
Instructions for setting up the MPPT-V08A Lithium Solar Charge Controller with CN3722 The information in the listings for these modules is virtually incomprehensible so after…
ESP8266 Fan Speed Control with DS18B20 Temperature Sensor
This simple project controls the speed of a fan based on the reading from a temperature sensor. The video below shows the fan speed changing when the temperature sensor is moved…
Arduino Uno with NEO GPS and OLED
This project displays the latitude and longitude from a GPS sensor on an OLED display using the I2C protocol. In the video below you can see a splash screen is displayed with some…
PIR Movement Detector with a 3v Mosfet Relay
The 3.3v output from a PIR movement detector doesn’t have enough current to energise a mechanical relay. With a little modification it is possible to make it work with a…
ESP8266 with two BME280 Sensors over SPI
I had a problem with the wiring on this one. With SPI you use the same pins for SCLK (SCL pin on the BME280 boards) , MOSI (SDA pin) and MISO (SDO pin) and then each SPI sensor…
ESP8266 and BME280 Temp, Pressure and Humidity Sensor over SPI
As part of a bigger project to measure temperature and humidity I’ve set up the NodeMcu ESP8266 (ESP12E) with a GY BME280 as below. I’m using ‘Software’…