This article is also now available as a full video walkthrough with an example, click the link below to open the video in a new tab:
Would you like to have a device that can detect credit card skimmers, hidden Apple Airtags, find Bluetooth and WiFi devices and test the security of your own home network? And how about all that for $20 in hardware and a free open-source software install. Meet the ESP32 Marauder.
Disclaimer – This site does not provide medical or legal advice. This security tool should be used in the context of defensive purposes as well as testing devices and networks that you own.
The video above details the steps I went through to build one of these devices. The good news is that you can now find all the hardware pre-built if you are interested in following along. This is the part that has the ESP32, screen, and card reader all pre-installed. “2.8” ESP32 Module ESP32-2432S028R WiFi+BT Dual-core 240X320 Smart Display Screen LCD TFT Module ILI9341 Driver for Arduino IoT”. You should be able to find it for around $20 online. That will save you the steps of building the electronics yourself.
If you want to repeat my exact build if you are interested in learning electronics, this is the video I used.
My video above goes through the firmware install for the ESP32 Marauder. Once you have the hardware purchased or assembled, you will then install the firmware.
First, you will likely need to install the device driver for your ESP32. https://www.silabs.com/software-and-tools/usb-to-uart-bridge-vcp-drivers?tab=downloads. The exact steps I performed were to download the driver above, then in the windows device manager, with the ESP32 plugged into usb, I selected the device and chose the driver above.
Then you download the V4 versions of the firmware on this page. https://github.com/justcallmekoko/ESP32Marauder/wiki/update-firmware
And finally, you update the firmware using this page, pointing to the 4 files you downloaded from the firmware page. (Again, my video above walks through all this in some more detail if you’re setting one up for yourself) https://esptool.spacehuhn.com/
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