stickbreaker
commented
4 years ago @SkeeterOG Does the LIRDARlite have the pullups to 5v?
connect your pullups on the ESP32 side to 3.3v use 3.3k ohm.
Diagnostic ideas:
- try this i2c Scan sketch
- Enable Core debugging. Set CORE DEBUG LEVEL to INFO
- Enable debug buffers in
esp32-hal-i2c.c. uncomment line 45://#define ENABLE_I2C_DEBUG_BUFFEROn Windows 7, installed with BoardManager this file is hereC:\Users\{userName}\AppData\Local\Arduino15\packages\esp32\hardware\esp32\{version}\cores\esp32 - rerun your tests and posts the debug log.
Chuck.
SkeeterOG
abedin17
Description:
I've been attempting to run my LIDARLite v3 with my ESP32 via I2C connections (Arduino IDE). So far I've been completely unsuccessful. I've had this Lidar running on multiple other boardsvia I2C (Arduino Uno, Nano, Adafruit Feather M0), and so far the ESP32 is the only one I can't work with. I use the standard example given with the Lidar (below), and modify from there typically. I attempted to follow the guidance on issue https://github.com/espressif/arduino-esp32/issues/2949 but was not able to make it work. I also followed the guidance here https://www.youtube.com/watch?v=qoc7N6Yg5jk (3 mins) Both of these solutions touched on the same issue: the Wire.begin() function causes some problems with ESP32. I attempted to comment out the Wire.begin() in the LIDARLite.cpp file and add my own into the main arduino code but this didn't work. Other solutions I tried were adding Wire.begin(21,22,XxX) where XxX is the I2C bus speed, changing it from either 100K or 400K; nothing. The LIDARLite v3 has internal pull-up resistors, but I also added 3K pull-up resistors at one point thinking that this might help (it did not). The output is typically a number representing the lidar's distance measurement, but so far the only output I get is "> nack" which represents a problem with the lidar (not specific, I know), which is fairly common when editing code or switching lidar wires around. I've also tried switching out the ESP32 boards, and doing basic examples with them to make sure that they're working (they are). Help me Obi-Wan Kenobi, you're my only hope! (Although I suspect @stickbreaker will be helpful as well)
Hardware:
Board: DOIT ESP32 DEVKIT V1 Core Installation version: 1.0.2 IDE name: Arduino IDE 1.8.9 Flash Frequency: 80 MHz PSRAM enabled: NO Upload Speed: 115200 Computer OS: Windows 10
Sketch:
/*------------------------------------------------------------------------------
LIDARLite Arduino Library v3/GetDistanceI2c
This example shows how to initialize, configure, and read distance from a LIDAR-Lite connected over the I2C interface.
Connections: LIDAR-Lite 5 Vdc (red) to Arduino 5v LIDAR-Lite I2C SCL (green) to Arduino SCL LIDAR-Lite I2C SDA (blue) to Arduino SDA LIDAR-Lite Ground (black) to Arduino GND
(Capacitor recommended to mitigate inrush current when device is enabled) 680uF capacitor (+) to Arduino 5v 680uF capacitor (-) to Arduino GND
See the Operation Manual for wiring diagrams and more information: http://static.garmin.com/pumac/LIDAR_Lite_v3_Operation_Manual_and_Technical_Specifications.pdf
------------------------------------------------------------------------------*/
include
include
LIDARLite myLidarLite;
void setup() { Serial.begin(115200); // Initialize serial connection to display distance readings
/* begin(int configuration, bool fasti2c, char lidarliteAddress)
*/ myLidarLite.begin(0, true); // Set configuration to default and I2C to 400 kHz
/* configure(int configuration, char lidarliteAddress)
*/ myLidarLite.configure(0); // Change this number to try out alternate configurations }
void loop() { /* distance(bool biasCorrection, char lidarliteAddress)
*/
// Take a measurement with receiver bias correction and print to serial terminal Serial.println(myLidarLite.distance());
// Take 99 measurements without receiver bias correction and print to serial terminal for(int i = 0; i < 99; i++) { Serial.println(myLidarLite.distance(false)); } }
Debug Messages: