hello
I have an arduino pro mini 5v 16Mhz, el cheapo from ebay, none official cheap Chinese rip off. the blink example worked.
I have an lcd 1602 and bought a backpack that allows it to work serial so only four pins. vcc gnd sdl sda. these pins are matched on the mini, I uploaded the example sketch which didn't specify pin attachments so I have taken for granted that they are attached to I^2C in the sketch, somewhere in the background(not visible).
a little red light appears on the backpack so there is a voltage going in but no lcd display. I measured voltage across pins and there is 3.4 volts on all four pins. this makes me think I have fried it.
anyone know of any tests I could perform? not including the "hit it with a hammer test"
thanks
simon
I did a little bit of testing and the voltage across vcc and gnd is 3.4 volts. so I thought it was 5 volts because that's what it said when I bought it. bloody cheap ebay scamming little F*&^%er's
but if there are any other thoughts on this a I think the lcd should still work with 3volts
I have an arduino pro mini 5v 16Mhz, el cheapo from ebay, none official cheap Chinese rip off. the blink example worked.
I have an lcd 1602 and bought a backpack that allows it to work serial so only four pins. vcc gnd sdl sda. these pins are matched on the mini, I uploaded the example sketch which didn't specify pin attachments so I have taken for granted that they are attached to I^2C in the sketch, somewhere in the background(not visible).
a little red light appears on the backpack so there is a voltage going in but no lcd display. I measured voltage across pins and there is 3.4 volts on all four pins. this makes me think I have fried it.
anyone know of any tests I could perform? not including the "hit it with a hammer test"
thanks
simon
I did a little bit of testing and the voltage across vcc and gnd is 3.4 volts. so I thought it was 5 volts because that's what it said when I bought it. bloody cheap ebay scamming little F*&^%er's
but if there are any other thoughts on this a I think the lcd should still work with 3volts