BMP180 not working

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rfj
 
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BMP180 not working

Post by rfj »

The BMP180 is wired to a UNO (5v to Vin, GND to GND, SCL to A05, SDA to A04).
The libraries are installed (sensor, BMP085, BMP085_U).
Sensorapi compiles and uploads.
When executed, "Pressure sensor test" appears on the serial monitor and that's all.
There is discussion in the documentation about an "ID" but I am not sure what to do there.
help
tnx bj

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adafruit_support_rick
 
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Re: BMP180 not working

Post by adafruit_support_rick »

Please post clear, focused, detailed pictures of both sides of the BMP180, and of your connections to the arduino

minimalette
 
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Re: BMP180 not working

Post by minimalette »

My BMP180 is also not working. My connections (from BMP180 to Arduino Uno) are:
Vin to 5V
GND to GND
SCL to A5
SDA to A4

The sketch successfully compiles and uploads, but gives a message saying that the BMP180 is not detected and I should check my connections.

I've attached some photos showing my setup (including a DHT22, which is working). Have I connected something wrong? Is there a way to test if the BMP180 board itself is working?
bmp180 setup 1
bmp180 setup 1
photo.JPG (141.79 KiB) Viewed 2926 times
bmp180 setup2
bmp180 setup2
photo (2).JPG (143.47 KiB) Viewed 2926 times

minimalette
 
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Re: BMP180 not working

Post by minimalette »

Correction to previous post.
Vin is not connected to anything.
3V is connected to 3.3V
It is not connected to 5V. Sorry about that.

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RH3
 
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Re: BMP180 not working

Post by RH3 »

If you look closely at the arrows on the breakout connections you will see the 3.3v pin is an output not an input. VIN needs either 5v or 3.3v from the Arduino to power it.

Richard.

minimalette
 
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Re: BMP180 not working

Post by minimalette »

Thanks. I moved the wire from 3V to Vin. Now I've connected Vin to 3.3V on the Arduino. 3V is connected to nothing.

When I run the sample sketch, I get: REBOOT BMP 180 init fail.

Ideas?

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Franklin97355
 
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Re: BMP180 not working

Post by Franklin97355 »

Your pictures show a dht also in the mix. Try connecting ONLT the bmp and see what you get. Photos of the new setup wouldn't hurt, try to get them straight down so we can see the connections better.

minimalette
 
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Re: BMP180 not working

Post by minimalette »

Sure, I removed the DHT-22 and associated components. The test sketch still says that the BMP180 is not detected. Here is a photo.

Is it possible that there is a problem with the BMP180 itself? How would I test that?
photo (3).JPG
photo (3).JPG (148.48 KiB) Viewed 2877 times

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Franklin97355
 
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Re: BMP180 not working

Post by Franklin97355 »

Possibly, could you post a clear large photo of the soldering on the board? It is still quite hard to see.

minimalette
 
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Re: BMP180 not working

Post by minimalette »

Sure. Here is a closeup of the board.
photo (4).JPG
photo (4).JPG (128.52 KiB) Viewed 2866 times

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adafruit_support_rick
 
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Re: BMP180 not working

Post by adafruit_support_rick »

Still hard to se, but it looks as if the solder has not flowed onto some of the pads. Your solder joints should be shiny, with a concave section, like this:
Image
The solder should flow completely over the pad, and if should flow up the pin.

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