My basic question:
I have a pin that I need to ground in its normal ON configuration, but float when switched to a momentary (ON) position. The pin in question leads to the green cathode of a common anode bicolor LED.
I'm sure there are several ways of doing this - Optocoupler? SSR? Pair of transistors? - but I could use some help choosing the best method.
Purpose and Considerations:
My goal is to integrate a small battery monitor circuit into an existing, functional 12VDC portable device, running on 3x 18650 LiPo batteries. The battery monitor shares the device's bicolor LED, and uses it in an alternative circuit, activated in the (ON) position of the devices its On-Off-(On) switch.
This is my battery monitor circuit. For proper display, I would like to ground the red circled pin when the device is ON, and float the same pin when the device is (ON).
What's a reliable, small footprint way to do this?
Thanks!
(Mods - feel free to move to a different forum if this isn't the correct place to ask this question.)
I have a pin that I need to ground in its normal ON configuration, but float when switched to a momentary (ON) position. The pin in question leads to the green cathode of a common anode bicolor LED.
I'm sure there are several ways of doing this - Optocoupler? SSR? Pair of transistors? - but I could use some help choosing the best method.
Purpose and Considerations:
My goal is to integrate a small battery monitor circuit into an existing, functional 12VDC portable device, running on 3x 18650 LiPo batteries. The battery monitor shares the device's bicolor LED, and uses it in an alternative circuit, activated in the (ON) position of the devices its On-Off-(On) switch.
- The device's on/off switches power on negative for consistency, as the device uses a MOSFET relay that also switches high current on negative.
- The physical switch that will activate this meter is a SPDT, On-Off-(On), and I am trying to engage the battery monitor to work in the momentary (On) position.
- Diodes D5 and D6 are UF rectifier diodes and allow the LEDs to share inputs.
This is my battery monitor circuit. For proper display, I would like to ground the red circled pin when the device is ON, and float the same pin when the device is (ON).
What's a reliable, small footprint way to do this?
Thanks!
(Mods - feel free to move to a different forum if this isn't the correct place to ask this question.)