ESP32 Bluetooth Calipers

prusaprinters

<h3><strong>Sends caliper data to connected bluetooth device when button is pressed.</strong></h3><p>&nbsp;</p><p>Code, BOM, and full build guide available on <a href="https://github.com/Benjaminbburn/Bluetooth-Calipers">GitHub</a>.</p><p>&nbsp;</p><p>The goal of this project was to recreate the functionality of <a href="https://www2.mitutoyo.co.jp/eng/products/keisokusystem/wireless.html">Mitutoyo's bluetooth U-WAVE</a> using inexpensive hardware (total cost, excluding calipers, ~$15).</p><p>&nbsp;</p><p>I ended up using USB for power since I am always near my computer when using this and did not want to manage a battery. There is no reason a 3.3v battery could not be added to make it fully wireless. Bluetooth was chosen to send data since many ESP32's are not able to act as a HID (i.e. cannot act as keyboard/mouse).</p><p>&nbsp;</p><p>Supports two types of button presses:</p><ol><li><strong>Short press</strong>: Data is sent without pressing the return key (used when you want to modify the value)</li><li><strong>Long press</strong>: Data is sent and the enter key is pressed (used when the value does not need to be modified)</li></ol><p><br>&nbsp;</p>