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PostPosted: Sat Nov 21, 2020 4:27 pm
by Bonzo
I am going to reduce the size of my gps recorder by using a ESP12-e and a microSD card reader.

While looking for a micro SD card reader board I found the dm-3212 which looks like a ESP12-E with a micro SD card reader you can plug into a USB port.

It is described as "CJMCU-3212 Virtual Keyboard ATMEGA32U4 WIFI ESP-8266 ESP8266 ESP-12E TF Micro SD Card Development Board Module".

I want to use the ESP to write data to the SD card then read it back and upload it via WiFi. Does anyone know if it can be used for what I want or is it just a dedicated Virtual Keyboard?

I could not find a lot of information about it online.

Re: dm-3212

PostPosted: Sat Nov 21, 2020 7:19 pm
by AcmeUK

Re: dm-3212

PostPosted: Sun Nov 22, 2020 5:10 am
by Bonzo
Thank you for the link AcmeUK but I still unsure if I could use it for what I want.

I have found a better site this morning: https://github.com/TheMMcOfficial/CJMCU-3212-wifi_ducky It has a circuit diagram.

I am still not sure if it might cause me extra headaches. For now I think I will stick with a ESP12-E and a separate micro SD card reader. I will order one anyway and once I get everything running I will try it out on the CJMCU-3212.

Re: dm-3212

PostPosted: Fri Nov 27, 2020 10:32 am
by eriksl
Please note that the ESP8266 does not have a SD master interface (required to drive an SD card), it's SD card interface is a "slave" one. It is possible to drive an SD card, but only using the, optional, SPI interface, so better check your card supports it...