Sensor HAT

[rush0815]

Hi there,
I am developing a sensor HAT. Since some people reported bad GPS signal while having connected the GPS between the two SDRs, I thought do build a compact HAT including:

• ICM-20948 IMU
• BMP280
• ublox SAM-M8Q GPSs module.

Meanwhile the SAM-M10Q is also available. I think it makes more sense to put that module on the HAT.
The same with BMP280. This sensor is not recommended for newer design but is still available. BMP390 is the replacement part. Following a Bosch post, register names has changed. User @scheuss reported, that simply changing the I2C code and return value in the software make the sensor working.

I am not sure what to put on that HAT. What are your suggestions / thoughts on that?

[scheuss]

Hi
I would try to use the newest sensors if possible, so the BMP390. The ICM-20948 is also already not recommended for new designs but I do not know a better alternative part. A good GPS module make sense, I would recommend that your design supports active GPS antennas (that DC supply on the antenna line) At beginning I had not an active antenna and the GPS didn’t work very well. I would also add some LED and button to the raspberry GPIO, you never know what the future brings.
Roman

[rush0815]

Hi Roman!
Did you use that GPS USB dongle or which one? A link would be cool 😎
I had already in mind to design the NEO-M10N with active antenna support and an on board antenna for the users who want a compact device.

The point with LEDs and buttons is good!

[scheuss]

I built the ‘Build example 3’ with the TTGO T-Beam V1.1. It uses the GPS module NEO-M8N
Roman

[rudiratlos]

pls. consider to add an additional transistor to drive the case fans with pwm (PulseWideModulation). there is an overlay for config.txt to automate fan activity depended to cpu heat. this overlay uses specific gpios (e.g. pin18), which can do pwm by hardware.
dtoverlay=gpio-fan,gpiopin=18,temp=60000
https://forums.raspberrypi.com/viewtopic.php?t=343570

How is the progress of your project. I whould by such HAT.
regards.