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mcore1976 / sim7000gpstracker

This is simple GPS vehicle tracker base on SIMCOM SIM7000E/G/A module. Works for GSM/LTE-M networks around the globe
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UART Level Shifter? #1

Closed simme closed 3 years ago

simme commented 3 years ago

Hey,

Thanks for this project. Very helpful as a reference as I'm learning to do this myself :)

I'm just curious, according to the SIM7000 User Manual the UART interface of the SIM7000 operates at 1.8V, while as far as I can tell the ATMEGA is running at 3.3V. Did you not have to use a level shifter between them to get UART to work properly? Or do you know if the breakout board perhaps has that built in?

Best, Simon

mcore1976 commented 3 years ago

Hi,I havent use any level shifter to interoperate with SIM7000 board. It worked staight away. Also on tge board I cannot see any Zener diodes etc. so probably the chip accepts higher voltage levels and 3.3V is not a problem for it.cheersWysłano z mojego urządzenia Galaxy -------- Oryginalna wiadomość --------Od: Simon Ljungberg notifications@github.com Data: 13.01.2021 09:24 (GMT+01:00) Do: mcore1976/sim7000gpstracker sim7000gpstracker@noreply.github.com DW: Subscribed subscribed@noreply.github.com Temat: [mcore1976/sim7000gpstracker] UART Level Shifter? (#1) Hey, Thanks for this project. Very helpful as a reference as I'm learning to do this myself :) I'm just curious, according to the SIM7000 User Manual the UART interface of the SIM7000 operates at 1.8V, while as far as I can tell the ATMEGA is running at 3.3V. Did you not have to use a level shifter between them to get UART to work properly? Or do you know if the breakout board perhaps has that built in? Best, Simon

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simme commented 3 years ago

Thank you! :) Perhaps I'm having some other issues then.

simme commented 3 years ago

I managed to get a hold of the documents for the breakout board (just emailed and-global). The user manual states that the UART on the BK is 3.3v! So they have the level shifter built in.

It also says that the BK wants 5-10 VCC (5.0 is recommended).

Just a FYI if you're interested :) Attaching the manual.

BK-SIM7000 Board user manual V1.0.pdf

mcore1976 commented 3 years ago

thanks ! Wysłano z mojego urządzenia Galaxy -------- Oryginalna wiadomość --------Od: Simon Ljungberg notifications@github.com Data: 14.01.2021 22:44 (GMT+01:00) Do: mcore1976/sim7000gpstracker sim7000gpstracker@noreply.github.com DW: Adam Loboda adam.loboda@wp.pl, Comment comment@noreply.github.com Temat: Re: [mcore1976/sim7000gpstracker] UART Level Shifter? (#1) I managed to get a hold of the documents for the breakout board (just emailed and-global). The user manual states that the UART on the BK is 3.3v! So they have the level shifter built in. It also says that the BK wants 5-10 VCC (5.0 is recommended). Just a FYI if you're interested :) Attaching the manual. BK-SIM7000 Board user manual V1.0.pdf

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