Hi , i need use 3.3V from CNC SHIELD V3 , but on this device, i found that not GRN for 3.3V and i can not use it. Anyone know about it ? thank you
Is there continuity from the shield’s 3v3 pin to the 3v3 pin on the Arduino ?
Measure when no power is applied.
GRN, do you mean GND ?
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Ther is only one GND and it is the same GND for both 5 volt and 3.3 volt.
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The reset pin is not ground.
I checked my CNC shield V3, fitted to a genuine Uno, 3.3V and it measures 3.28V with respect to any ground pin that I check.
Ground pins in green boxes.
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I use 3.3 pin and GND pin for bluetooth HC-06 but it not working ( no flash light ) , so i have to use 5v pin and GND is ok, but this power is safe for HC-06 , I mean i have to use some resistors for HC-06 when i use 5v power ?
The HC06 module may require 5V for power (confirm for your module), but if used with a 5V controller there will need to be a resistor voltage divider on the controller TX pin to the HC06 RX pin. Check your module, some say 3.6-6V for power 3.3V level (pin input).
Tx of hc-06 to rx of arduino and rx hc-06 to tx arduino, need resistor too ? Power supply 5v to VCC of Hc-06
The RX (3.3V) of the HC06 needs the voltage divider to protect it from the 5V from the Uno TX pin. The RX (5V) of the Uno can accept the 3.3V from the HC06 TX pin with no problem, so the voltage divider is not needed.
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So, no need divider for all HC-06 pin ?
Are post #6 and post #8 unclear? How can i put it differently?
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