ELM327 ODB2 scanner casing with reset button

thingiverse

Recently, I purchased a budget-friendly OBD2 scanner for my car that features Bluetooth connectivity. It's the cheapest option currently available on eBay, priced at approximately 3.50 USD. To acquire this device, simply search for "ELM327 V2.1 OBD2 Bluetooth Scanner" on eBay. With this OBD2 scanner and a smartphone running the Torque app (or another compatible OBD2 application), you can view various real-time data from your vehicle, examine error codes, and reset error states in real-time. I initially intended to leave the device plugged into the car, but due to its continuous draw of 33mA current even when the vehicle is parked, it keeps consuming power. Unfortunately, this affordable model does not have a sleep mode. When transferring data, the maximum current rises to 65mA. After researching possible solutions online, I discovered that some individuals modify the OBD2 connector in their vehicles to supply 12V from the accessories, thereby only activating the module when the key is turned. However, this process can be quite tedious and requires access to the hidden OBD connector under the dash, which varies depending on your vehicle's make and model. Instead of making modifications to my car, I decided to hack the module itself, as it is relatively simple to do so. All you need to do is cut pin 16 connected to the PCB and solder a wire directly to the PCB. This wire can be connected to any accessible point behind the dash. Simple, indeed! However, I experienced some sporadic losses in Bluetooth connectivity, prompting me to add a basic reset button to the device. By incorporating a "push-to-break contact" button into the power line, the module resets, and the connection is restored within seconds. Alternatively, you can modify the OBD2 adapter by adding a toggle on/off switch instead of an external 12V supply wire. Just be sure not to forget to turn it off when parking your vehicle, as this could potentially drain your car battery over a few days if it has a small capacity and is in poor condition. To make my OBD2 scanner more user-friendly, I designed and printed a custom casing that snugly fits over the standard casing. Additionally, I drilled holes above each of the three LEDs and inserted transparent 1.75mm filament pieces to allow for easy viewing from any angle. To achieve this, be sure to trim the filament straight with a razor blade. Printer Settings: YAOP printer Resolution: 0.2mm Rafts: Doesn't Matter Supports: Yes Notes: I printed it in ABS, making sure not to overload the supports, as you may need to remove them with small pliers.