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the uc gpio is sourcing 3v3 into r5 will this make the 12v conduct for q3 if it ...
ril3y

ril3y

does this still hold true after a few changes?
2y
ril3y

ril3y

@copilot the uc gpio is sourcing 3v3 into r5 will this make the 12v conduct for q3 if it goes high/
2y

copilot

Yes, if the voltage at the GPIO pin (connected to R5.P1) goes high (above the threshold voltage, typically 2-3V for a standard MOSFET), it will turn on the MOSFET (Q3) and allow the 12V to conduct from the drain to the source.
Here's the brief explanation:
  • The Gate of the N-Channel MOSFET (Q3.Gate) is connected to the second pin of the resistor R5 (R5.P2).
  • The first pin of R5 (R5.P1) is connected to a GPIO pin of U1 (U1:BCM16_A7_D7).
  • When the output of the GPIO pin (U1:BCM16_A7_D7) goes high (3.3V) that would cause a voltage drop across the resistor R5. This voltage drop is effectively applied to the gate of the MOSFET (Q3), which turns on the MOSFET if it exceeds the gate threshold voltage.
  • Once the MOSFET Q3 is turned on, it would allow current from the Drain (connected to 12V) to the Source, thus "12V conducts".
Please confirm if this is the desired operation for your design. Please also note that resistor R5 plays a crucial role in defining the rise/fall time and protecting the GPIO pin from high voltage and current. Its value could be chosen based on the specific application.
2y
2
M3
M1
M2
M4
POWER
GND
GND
GND
3v3
R5
Resistance
110 Ω
3v3
U1

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