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October 8, 2011
about 7 years ago
nvm I figured it out.
I (noob) need help figuring out how to wire this thing.
I’m connecting the GND to netduino’s GND, IN1 to netduino’s 3V .
For the noisy side I need to drive a small motor but for now I’m using a light bulb just to see the result. Output is connected like this: HVG to battery’s one side, HV to the other side of the battery (I tried switching battery poles but still no success) and I expect the voltage between HVG or HV and OUT1 to change when I plug/unplug IN1 from 3V but I don’t get either result, the bulb remains dark and the multimeter doesn’t show anything changing.
about 7 years ago
It would’ve been nice to mention that in the documentation.
It’s also a problem that once the baud rate is set it’s kept in non-volatile memory, so power-cycling doesn’t reset it to 9600 and there’s not signal (as in separate wire) that would cause that baud rate to be reset. There’s a command to reset it but when you don’t already know the rate then sending a command is not only useless (there’s no feedback) but also there’s no way of knowing what did the display actually read in place of what you wrote on the line.
The end result is that I can have the patience to troubleshoot one unit but I can’t buy 500 pieces to make a batch of my devices, I still have to look elsewhere and will still have to spend a whole new effort to switch to another display.. Which makes this device useless, but I already pointed that out.
Your tech support is nowhere to be found.
I did, however, figure out the problem. It was in the chinese to english translation done by germans…
Default baud rate in the manual is listed as 9600 but the actual default baud rate is 2400. As a result if you trust the manual you end up seeing random output as there’s a stop bit and even sending all 0s will result in random readings by the receiving end.
Very much useless.
I’ve been trying for two days to decipher the protocol as described in the user manual and all I get is random segments turning on and off.
I’m now convinced the manual was written in chinese, then translated by germans into english.
My application is netduino, connected to the display by serial interface. My test code writes 32 zeroes to the serial port (9600/n/8/1) and then just blinks the led in an endless loop. Every time I reset the device a different set of segments light up. I tried varying the port settings to no effect, tried sending reset commands - nothing helped so far.
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