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Hi MitchDOk re read the posts and used a proper computer instead of the tablet. They are diodes and they are probably intended to stop the lines from being dragged to level s that may blow the transistors. The Matho's board does not have them. Transistors backwards may not really explain why it works on 8v and not at 12?I do not have the parts list for the Danny board. The BC337 in the other one are fairly standard. I think the One I have currently is using the 2n2222. Either works if used correctly but I guess you are not planning to invert the signals in the sketch either. You could put a resistor around 800 to 1000ohm in as the load for the two SSRs and measure the pin in manual mode and see if it changes. can also measure the pin on the arduino at same time. If you have Leds in the other "Htr" on and Pump On then can probably just watch those and disconnect the SSRs? The normal SSRs are AC switches not DC and will not switch 12 v dc for a pump? That is why Matho used a relay. With Relay you need protection diode across the coil and it also put 240v on the main PCB which can catch you out if not careful.Like any problem make it a linear process. measure the arduino pin then the transistor output then the SSR etc.
Hi MitchD
Ok re read the posts and used a proper computer instead of the tablet. They are diodes and they are probably intended to stop the lines from being dragged to level s that may blow the transistors. The Matho's board does not have them. Transistors backwards may not really explain why it works on 8v and not at 12?
I do not have the parts list for the Danny board. The BC337 in the other one are fairly standard. I think the One I have currently is using the 2n2222. Either works if used correctly but I guess you are not planning to invert the signals in the sketch either. You could put a resistor around 800 to 1000ohm in as the load for the two SSRs and measure the pin in manual mode and see if it changes. can also measure the pin on the arduino at same time. If you have Leds in the other "Htr" on and Pump On then can probably just watch those and disconnect the SSRs? The normal SSRs are AC switches not DC and will not switch 12 v dc for a pump? That is why Matho used a relay. With Relay you need protection diode across the coil and it also put 240v on the main PCB which can catch you out if not careful.
Like any problem make it a linear process. measure the arduino pin then the transistor output then the SSR etc.
