duhvoodooman wrote:
benjaminlongman wrote:
Sorry just to check, by 'see what happens' are you referring to voltages or relays/leds?
The latter. Making those connections on the MCU should trigger the relays--1 & 5 for relay 1 and 1 & 2 for relay 2. Take a look at the first page of the CJ schematic and you can see how the MCU is connected to the relay sections.
There are several layers involved in the switching.
1. The footswitches are connected to pins 4 and 7 of the MCU, which are set to inputs. When those pins recognize that the footswitch has shorted to ground, the switching routine begins.
2. Pins 5 and 2 are set to outputs and send 5V when they are "on".
3. The relay coils draw too much current for the MCU to handle, so the MCU is actually turning Q1 and Q2 on and off while simultaneously turning the LEDs on and off as well.
4. Q1 and Q2 supply the voltage to their respective relay coils.
By making those jumpers in the empty socket, you are skipping steps 1 and 2.
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