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Metro M0 Express and RGB LCD Shield
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Please be positive and constructive with your questions and comments.

Metro M0 Express and RGB LCD Shield

by bbutl58 on Sat Jun 23, 2018 4:20 am

I have tested an RGB LCD shield (with mono lcd) on an Arduino Uno using the Hello World example program and it works perfectly (using A4 and A5 for SCL and SDA).

However, when I try the same configuration on the Metro M0 Express nothing works. I have tried connecting directly to SCL and SDA pins without success.

I must be missing something?

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Re: Metro M0 Express and RGB LCD Shield

by adafruit_support_mike on Sun Jun 24, 2018 11:42 pm

The LCD needs 5V to operate, and the M0 Express is a 3.3V board.

You'll need to power the LCD from the 5V pin and use an I2C level shifter for the signals:

https://www.adafruit.com/product/757

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Re: Metro M0 Express and RGB LCD Shield

by bbutl58 on Mon Jun 25, 2018 8:49 am

Do I simply connect the M0 pins A4 and A5 (or SCL and SDA) to the Level Converter A1 and A2, and connect B1 and B2 to the RGB LCD Shield pins?

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Re: Metro M0 Express and RGB LCD Shield

by adafruit_support_mike on Tue Jun 26, 2018 3:57 am

You'll also need to connect 3.3V to the VL pin and 5V to the VH pin, and GND to one of the GND pins.

Those are the correct signal connections though.

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Re: Metro M0 Express and RGB LCD Shield

by bbutl58 on Tue Jun 26, 2018 5:06 am

Thank you!

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Re: Metro M0 Express and RGB LCD Shield

by bbutl58 on Tue Jun 26, 2018 7:49 pm

Is Adafruit going to produce an RGB Shield which will work with the M0 Express that does not require a Level Converter?

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Re: Metro M0 Express and RGB LCD Shield

by adafruit_support_mike on Wed Jun 27, 2018 1:42 am

I don't know of any plans for one, but will mention it to the products team.

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Please be positive and constructive with your questions and comments.