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Support Forum » LCD project, no display
August 02, 2011 by edb |
I recently received my Nerdkit and yesterday wired the sample circuit. I get no visible response on the LCD panel, and have checked voltages and included below, along with a picture of the wired kit. Notice that I chose to use colored wires to the LCD coded as: red +5V, green ground, blue contrast, yellow data signals. I also moved the voltage regulator, resistor and associated wires down one pin to avoid using the end row (personal preference). Following confirmed with multimeter: Battery 9.6 V Regulator out 4.67 V Both rails 4.67 V pin 1, 7, 20 & 21 MCU 4.67 V Resistor 0.97 k From LCD pin 3 to ground (drop across resistor): 370 mV From MCU to LCD pin: pin 4 4.67 V pin 6 fluctuating around 10 mV (9 mV to 11 mV) pin 11 fluctuating slightly 4.2 V to 4.6 V pin 12 fluctuating 40 mV to 60 mV pin 13 fluctuating 40 mV to 60 mV pin 14 fluctuating 4.2 V to 4.6 V I assume fluctuation not precise due to meter limitations, possible indicating MCU signals. Please let me know if you see anything terribly wrong 'cause I'm stymied ... Thanks, Ed |
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August 02, 2011 by Rick_S |
I don't know if it's the angle of the photot or not, but it appears your crystal is off by 1 row. Again, that may just be the photo. Also maybe the angle, but it looks as though the 4 LCD data wires may be shifted 1 position. (how many empty spots do you have at the end of the connector? There should be 2) Other than those possibilities, I don't see anything that stands out. Rick |
August 02, 2011 by Ralphxyz |
What happened to your breadboard on the left side? It looks like it was severed (chopped off) roughly. It's missing rows 1 and 2. Your wiring looks good but I'd take it apart and redo it. It's hard to tell exactly what the two green (GND) wires are doing but I asume they are run to ground. You might want to move the two ground wires up to row 8 and 9 the same thing with your red power wire in case the breadboard got damaged on the end. Ralph |
August 02, 2011 by edb |
Ralph, no there's nothing wrong with the breadboard, you're seeing the edge of the box I have this sitting in. Green wires are grounded. Rick, there's supposed to be 2 open pins on the end of the LCD? Wow, I guess I can't missed that in the project photo. I double checked and that's it, THANKS! |
August 02, 2011 by Rick_S |
No problem, glad you are up and running. BTW, Page 29 of the manual has a chart and photo showing the exact pins from the breadboard to the LCD connector. Rick |
August 02, 2011 by edb |
Yeah, that's where I double checked. The picture on page 30 is the one that 'fooled me'. Thanks again. |
August 02, 2011 by Rick_S |
Yeah, I saw that one too. From their angle I could see it looking shifted. |
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