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Step 8Testing everything
After fitting all components to the pcb except the microcontroller, inspect the board to check for solder splashes, dry joints etc. (also use a multimeter to check power supply tracks for shorts if you have one.)
Apply power and check the regulated voltage between TP1 & TP2 (should be 5 volts).
Disconnect the power.
If all checks so far are OK, fit the microcontroller in it's socket and apply power.
All leds should light-up for a few seconds at power-on. If some do not light, turn-off the power and check their connections.
During the display, watch some of the non-random led patterns, looking for any lack of symmetry. Fix any wiring mistakes by tracing the led connections,comparing them to the anodes and cathodes wiring diagrams.
Apply power and check the regulated voltage between TP1 & TP2 (should be 5 volts).
Disconnect the power.
If all checks so far are OK, fit the microcontroller in it's socket and apply power.
All leds should light-up for a few seconds at power-on. If some do not light, turn-off the power and check their connections.
During the display, watch some of the non-random led patterns, looking for any lack of symmetry. Fix any wiring mistakes by tracing the led connections,comparing them to the anodes and cathodes wiring diagrams.
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