AZDelivery 5 x GY-68 BMP180 Digital Barometric Pressure Temperature and Altitude Sensor Module Board compatible with Raspberry Pi including E-Book!

The accuracy of the temperature measurements varies greatly between specimen. Out of the three pieces that I bought, only one was within the accuracy range specifiecd in the datasheet for the BMP180; the other two were off by as much as +3 degrees Celcius at around room temperature.I don't have an opinion about the accuracy of the pressure measurements as I haven't worked on that part yet.I used this with an AVR ATtiny85 and an AVR ATmega368p, both programmed 'bare metal'. The I2C protocol is well documented in the Bosch datasheet and was fairly easy to implement with bit-banging. One word of caution: follow the I2C protocol to the letter, or you might end up wasting time chasing self-inflicted bugs, like I did. For example, the datasheet says to send a STOP and wait at least 4.5ms after sending the command to start a temperature measurement. I thought I could get away with a RESTART instead of a STOP/START, but that caused some false and misleading readings to be returned -- I had to send an actual STOP on the I2C bus to get the correct readings.This module comes with header pins *unsoldered*, so you will have to solder them on by yourself. But this is not a big job as there are only four of them.The BMP180 works with 3.3V nominal but has an absolute maximum of 4.25V according to the datasheet. However, the module itself has a 3.3V regulator with a maximum input of 6V. This means that if you accidentally connect it to a 6V source, no damage would have been done.The module also contains two 4.7K resistors on the SDA and SCL bus, so you don't have to add those to your circuit.Despite the disappointing inaccuracy, this module is fun to work with and to get results quickly.

If you want a sensor to play with or do a bit of R&D with them this will make you happy. If you want accurate temperature measurements this will not work out for you.Bosch say that it's accurate to +/- 2 degrees. I don't have calibrated equipment but I think that it's nearer to +/- 5 degrees.It costs pence though and it is very fast to respond, unlike more expensive and accurate sensors.For it's price and operational parameters it's a fine product and worth buying. If you want accurate though you need to do some googling.

The product is well designed and easy to set up. I'm using it for a wireless weather station and using the example code which means very little programming needed to get it working. Also as well as pressure it has an accurate temperature sensor which can be used too. So two sensors on one board.Also AZ customer service is amazing. One out of the three supplied refused to work, wrote to AZDelivery and no quibble they have sent out a replacement. I would recommend the BMP180 and AZDelivery.

Excellent, low cost sensor. You just need to be careful to connect VIN to the 3.3V supply pin on the Arduino not the 5V. This is documented in the SFE_BMP180 library you need to download to use the sensor. It is safe to connect the SDA and SCL pins to the I2C ports on an Arduino, as the pullup resistors on the BMP180 board will keep the voltage below 3.6V.

Great product that works straight out of the box. Easy to solder and hook up to my Arduino and easy to get the sketch and library so all in all I wouls recommend this product.

This Bosch BMP180 sensor is pretty great. I'm mostly writing my old code so I used the provided libraries provided libraries as a guideline, and gosh, it was so much fun figuring this one out. With the Adafruit libraries this is probably going to be so much easier, but the sensor works just as it should. I might buy more if I setup a production line ;)

I’ve bought many items from AZ delivery and these sensors are up to their high standards.

Used this BMP180 for an Arduino product , it does 'what is says on the tin' !!No problems...... happy customer.