This pressure switch project is built using a piezoresistive transducer, LM358 OPAMP as comparator, and a relay. The circuit activate the relay when the pressure in a system exceed a given set-point. Basically, this switch can power ON or OFF a pump, valve, motor, when certain pressure is reached. A trimmer potentiometer is provided to set the […]
LIQUID OR AIR PRESSURE SWITCH WITH RELAY Read More »
Another fun little i2c device acquired cheaply via eBay. It reads barometric pressure and temperature. There’s some relatively simple maths to convert the outputs to something readable. Once again, ADAFruit provide a fantastic guide and library for using the device in their Using the BMP085 with Raspberry Pi. As in previous posts, I could have just used
Raspberry Pi reading BMP085 Temperature & Pressure Read More »
The BMP180 device is a digital barometric pressure sensor. This is available on a small module which provides access to the sensor via the I2C interface. This allows us to easily connect it to the Raspberry Pi with a minimum of wiring. My module is a small pcb measuring 15x13mm with a 5 pin header.
BMP180 I2C Digital Barometric Pressure Sensor Read More »
