I’m having some issues getting a signal on the oscilloscope from the signal generator board, when it’s powered by the 12V power supply. This is a continuation of the Dropbot project at the Jeffrey lab (which Mindy, Linh and Florent worked on). Mindy and Linh were working with Microdrop 1.0, I’m using v2.4. Weirdly, when I tried powering from the FDTI cable to an office desktop computer for the first time, it didn’t give a signal, bu reconnecting the power supply subsequently gave reasonable waveforms at both the input to the amplifier and at the output (gain ~ 30). However, when I tried to run it on Microdrop on my laptop, I got a LOW VOLTAGE error (it showed 0.2 V). (I couldn’t simultaneously plug into the oscilloscope and the amplifier today due to lack of BNC adaptors.)
Multiple tries of plugging the signal generator back into the oscilloscope after this gave no measurable signals. When I switched back to FDTI power again the oscilloscope showed a 0.6 Vp-p measurement at the input to the amp, and about 3 Vp-p at the output.
I tried going through the steps again to ensure everything was properly installed. Under the Device Manager, right-clicking on Arduino Mega tells me that the driver is up to date. When I tried to re-flash the control board, I got this (see below). Compared to the screenshot you guys provided, it seems to be missing lines saying ‘Found i2c address’ and ‘HV board 0/1/2 connected’ – not sure if this matters. This is similar to what Henry Bissel screenshotted in another thread (https://groups.google.com/d/msg/dropbot-dev/h0qg0Gp_vS8/FkuFoUqfAgAJ). I had to close Microdrop when I opened the serial monitor to enable Arduino to access the port which the Mega was on.
ÀAnalog Reference=4.70 V
Arduino DMF Controller v2.1
Firmware version: 1.4.4
I also tried to flash the signal generator while powered by the power supply but got a list of errors (I can’t use the FDTI cable to power it cos then the Arduino program wouldn’t be able to see it). In any case, the version of signal_generator.ino firmware I was trying to flash was 0.2.2; but when I disconnected the power and opened the Serial Monitor for my Uno, I found the firmware listed was 0.4.0. Does this mean it’s already been updated and I don’t have to do anything?
This is where I got up to but I’m not quite sure how to proceed. Does anyone have suggestions?
Really appreciate any thoughts on this!!