Hello all,
I have the following assembly that I want to be powering from a battery I am recharging via a solar charge controller (see image).
- Witty Pi L3V7 (capacitor between the 3v3 and GND pins)
- Pi Zero 2
- Waveshare SIM7600G-H
The assembly is stacked as in the picture.
While when I'm powering the assembly via a USB connected in a wall plug it powers up correctly, when I'm trying to power it from the battery charge controller (both USB and 12V to 5V/5A step down converter) it doesn't want to start up.
Any one has an idea on how to resolve this issue?
On the picture you provided, I do not see how your Witty Pi 4 L3V7 be powered: its USB-C connector is not connected, and I do not see any wire connects to Witty Pi 4 L3V7.
If you want Witty Pi (any model) to control the ON/OFF of Raspberry Pi, Witty Pi should be the only one who gets powered and it decides when to power your Raspberry Pi.
If your Raspberry Pi is powered from somewhere else, your Witty Pi is bypassed and will not function.
Attached is the log and there's a video following.
The video can't upload, but I need two clicks on the witty power button to be able to turn on the device. I have also added a capacitor in the unpopulated 7-pin port to stabilize the current.
Please let me know what the solution can be.
On the picture you provided, I do not see how your Witty Pi 4 L3V7 be powered: its USB-C connector is not connected, and I do not see any wire connects to Witty Pi 4 L3V7.
Have you read this?
On the picture you provided, I do not see how your Witty Pi 4 L3V7 be powered: its USB-C connector is not connected, and I do not see any wire connects to Witty Pi 4 L3V7.
Have you read this?
I have. I'm uploading an newer figure. I assume I would not be able to take the aforementioned screenshot if Witty Pi 4 L3V7 was not powered.
The USB-C is connected to Witty Pi 4 L3V7 and on the other side directly to a wall plug.
@konstantinos-belivanis How do you power your Waveshare SIM7600G-H? Does it take power from Raspberry Pi?
While when I'm powering the assembly via a USB connected in a wall plug it powers up correctly, when I'm trying to power it from the battery charge controller (both USB and 12V to 5V/5A step down converter) it doesn't want to start up.
In the two cases you mentioned, your Witty Pi 4 L3V7 was powered in the same way: via that USB-C connector or that 5V pad. If I understand it right, you do not use that connector for 3.7V battery. How could powering the board via the same connector leads to different results?
I need two clicks on the witty power button to be able to turn on the device.
Does your 5V power source has "sleep mode" or something similar? This looks like the load detecting circuit turned on the output after you tap the button once.
@konstantinos-belivanis How do you power your Waveshare SIM7600G-H? Does it take power from Raspberry Pi?
While when I'm powering the assembly via a USB connected in a wall plug it powers up correctly, when I'm trying to power it from the battery charge controller (both USB and 12V to 5V/5A step down converter) it doesn't want to start up.
In the two cases you mentioned, your Witty Pi 4 L3V7 was powered in the same way: via that USB-C connector or that 5V pad. If I understand it right, you do not use that connector for 3.7V battery. How could powering the board via the same connector leads to different results?
I need two clicks on the witty power button to be able to turn on the device.
Does your 5V power source has "sleep mode" or something similar? This looks like the load detecting circuit turned on the output after you tap the button once.
The 5V power source does not have a "sleep mode". The same power source powers a identical assembly with no issue.