Garmin LIDAR Lite

We'll interface Garmin LIDAR Lite with esp32-pico-kit.  esp32-pico-kit interfaces the LIDAR using I2C.   We'll make use of the wireless connectivity.  First we'll transmit the data through Bluetooth.  And we'll the esp32-pico a webserver that'll display the data through WiFi.

The LIDAR runs on 5V, but itself I2C signal is 3.3V, which matches esp32.

We'll use Garmin's LIDARLite_Arduino_Library .  First, we'll try out the library example GetDistanceI2C.  It compiles and is uploaded without a problem.  After hooking up the I2C and 5V, the serial monitor spits out numbers.  For this, the Arduino serial plotter is a great tool to view the output.

Next we'll try to run esp32-pico-kit as a Bluetooth serial device.  We run the SerialToSerialBT example without a problem.  We have two way communications with a Bluetooth serial app on a smart phone.

Then we'll try an example of setting up a WiFi access point.  That also goes without a problem.

Now we have tested the major pieces and are ready to put them together.  We'll start with the LIDAR and BT serial.  That uses 72% of Flash and 12% RAM.  It works nicely .

We'll create a webserver to display the range data next.  We set the web page to auto refresh every second.   It uses 51% of Flash and 11% RAM.  It works just fine.  A lot of features can be added, such as displaying a live graph and changing registers etc.

The ease of create a working IoT system with arduino is quite amazing.