I would like to using external power (wall charger not the battery ) to log some data from UART0 of the Logomatic v2. Is it possible?
Yes, just hook up a 5v wall-wart to the bat and gnd connections, this should get regulated down to 3.3v by the onboard LDO. Check the schematic to be sure.MontanaTrout:
I would like to using external power (wall charger not the battery ) to log some data from UART0 of the Logomatic v2. Is it possible?
do you need the 3.3V for UART?
Just learned, if you want to do ADC better supply 3.3 V. Otherwise you can supply anything between 3.3 and 8.5 V.
Can I use the USB as an external power (instead of using VCC, GND breakout pin)? so I can power up the Logomatic and charge the battery at the same time. When I unplug the external power, the system continue work using the internal battery.
as soon you put it on Usb it stops logging.
I found that it does whacky ADC conversions when on battery and it seems your batteries only last for a few days. Better buy a tiny power supply 5V or 6V and, one of these plug in warts, and connect it creatively to your logomatic.
This is just from me memory of how the loglmatic works, but I don't think you should be putting anything over 3.3v into VCC. I think VCC is the power rail that the LPC2148 run's on.MontanaTrout:
Can I use the USB as an external power (instead of using VCC, GND breakout pin)? so I can power up the Logomatic and charge the battery at the same time. When I unplug the external power, the system continue work using the internal battery.
Hi Steffen,
You can apply 3.3V externally through the 3.3V pin up near the reset
button. This voltage is not regulated, so make sure that your supply is
clean and regulated. Also, don’t connect anything to the battery
connector if you’re going to supply 3.3V straight to the board.
Regards,
-Support
there you have it
I am going to updating the Logomatic v2 firmware to allow the logger continue work while wall charger plug into the USB. I am new to ARM, Anyone knows which function need to be changed. Thanks.