| Description for Image 1: First... a few older PHCC related pictures. This shows the MCP seven segment displays and (in the upper right hand quarter of the PCB) the now deprecated DOA_630_2803 seven segment display controller board (successor is the DOA_7seg_2803). | |
| Description for Image 2: As you can see, the PHCC 7 segment controllers are not limited by what they can display. Every combination of segments is possible. | |
| Description for Image 3: closeup of the old 7seg controller board | |
| Description for Image 4: displays in dark environment. | |
| Description for Image 5: The PHCC motherboard prototype. (The board is a Rev.3) The 3pin header rows with jumpers on them are the analog inputs. The jumpers prevent bogus readings on analog channels that are not connected to anything. | |
| Description for Image 6: First tests of the LCD controller firmware. This is a surplus 4x27 character LCD display. Just 5EUR at pollin.de. | |
| Description for Image 7: The LCD controller in the lower right hand corner, built around a PIC16F628 chip. The future version will use an 28pin 18F series PIC. | |
| Description for Image 8: same controller, different display (with backlight) | |
| Description for Image 9: in an darker environment, the backlight comes out better. | |
| Description for Image 10: This is how the 4x27 displays came: just a short plastic cable where the fitting connectors are hard to obtain. I just removed that cable and carefully soldered a long 'normal' ribbon flat cable to it. This allows me to use IDC type connectors at the controller board side. For this soldering job, solder wick (desolder braid, or whatever its called elsewhere) is highly recommended to remove excess old solder and bridges made while soldering the new cable on. | |
| Description for Image 11: ... second, here are some new pictures ... This shows a dual panel of the 64 input keymatrix boards with IDC type connectors for ribbon cables. | |
| Description for Image 12: the solder side. this board was also made using the toner transfor technique. This was taken before the diodes were soldered in. | |
| Description for Image 13: The component print was also made with toner transfer and a coat of plastic spray at the end. | |
| Description for Image 14: And here with the diodes soldered in. | |
| Description for Image 15: Puhhh puttint those 128 diodes in is quite a bit of work. Bending the pins, pushing the legs through the holes, temporarily fixing and then soldering 256 points... | |
| Description for Image 16: Each board is 160x100mm. So each panel is 80x100mm. Fits well. | |
| Description for Image 17: Closup of one panel. The four leftmost connectors are for the rows (64 of them, organized 4x16), then we have the columns (8 of them, on the 2x16 connector in the lower right hand side corner just below the IC socket) and finally the connector to the motherboard. | |
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