I2C Scanner: https://go.particle.io/shared_apps/5ac7a964926c9fe8cb00049e. So for high I2C speeds you need lower resistors but it also "wastes" more energy since current will flow through the resistors every time the wire gets driven low. Using the Arduino I 2 C address scanner, it is unable to find a device, even though it is wired correctly (I've checked multiple times).. looked like with the commenting of the lines and moving the clock. fluctuations seem to be on the falling clock, i guess the drain causes it. myLidarLite.configure(0); // Change this number to try out alternate configurations What your changes did was exactly that... add a low clock on repeated start. If all the i2c peripherals are working properly, the problem is at Nucleo. I'm not 100% sure if it's really floating or stays high all the time with a lot of noise. // For example on the Arduino.cc forum. Also, you state your sensor needs between 4.75 to 5.5V to operate, but if you have wired it the same I did (as … i am student at final engineering project that for now is not working =( we (i and my partner) wrote the most of program but at I2C part we are stuck for 3 weeks now. Else it will not work… but from what I know I think the one with the 10k pullups will have less steep rising edges because the 10k resistor takes longer to charge the parasitic capacitance in the i2c wires. distance(bool biasCorrection, char lidarliteAddress). It has 4.7K pullup resistors built in . Try using DriverHub to install an older driver if you can't find it on the manufacturer's website. myLidarLite.begin(0, true); // Set configuration to default and I2C to 400 kHz, /* It displays only: No i2c devices found. { There is something different about the Invensense I2C bus/controller that is causing the I2C bus to latch up. Some notes: I had to use the i2c low level functions instead of the Wire lib because Wire checks the return codes and it chokes on some return value and the stops transmitting so you dont see much on the scope there. It worked pretty well with other microcontrollers as a slave. Thanks for the explanation I understand more nowOn Tue, 16 Jun 2015 04:37:21 -0700 Normally, you do need pull-up resistors for I2C (afaik), especially if the sensor doesn’t already have them internally, so leave that in your setup. I am running code to scan available devices on I2C bus by using HAL_I2C_Master_Transmit() . It’s the ideal compact, high-performance optical distant measurement sensor solution for drone, robot or unmanned vehicle applications. { @wizard23 I imagine that you have that scaled so two of the big squares are 3.3V? I must have messed up, sorry. This very simple sketch scans the I2C-bus for devices. { LIDAR-Lite Ground (black) to Arduino GND, (Capacitor recommended to mitigate inrush current when device is enabled) bello is a comparison between your changes and my code before the fix mentioned above. If both of above addresses won’t work, you should try using I2C device scanner program. I did try a capacitor with the photon but still no readings. void setup() The i2c_port_address_scanner.ino will not only discover the address of your I2C device but also the PORT numbers to which SLA and SLC are connected. Also without the LiPo connected, your device may not be able to reliably connect to the cloud and hence not start running your code (unless you are using non-AUTOMATIC or multi threaded mode - hence the request to see your code). As I have no other output then the screen, the thought behind the code is to scan for devices and then when it finds one (the LCD is the only one connected to the bus) should then print the address :) This is probably only a concern in battery powered low power apllications like a I2C realtime clock that should run for several months. Serial.begin(115200); // Initialize serial connection to display distance readings, /* Unfortunately, the code returns error == 0 for all addresses. This is the code I used, i2c_scanner, and this output: Now that we know our displays i2c address, we can open the example sketch in our adafruit ssd1306 library. Neither under C++ nor C#. // The original author is not know. Resolution is also defined in the library of the OLED display. begin (9600); Serial. I forgot the ground connection so it was floating. When space and weight requirements are tight, the LIDAR-Lite v3 soars. My circuit is shown below and I am definitely supplying the sensor with 5V. NOTE: I also have an RTC and another sensor (MPU6050) on the same I2C lines. However, initially the MPU6050 also did not work with similar behaviour as the BMP280. We’ll occasionally send you account related emails. I'm not sure what your fix was but it is important when working with I2C to remember that I2C (but not SMBus) is a "static" bus meaning it will operate with clock frequency down to DC. Powered by Discourse, best viewed with JavaScript enabled, https://go.particle.io/shared_apps/5ac7a964926c9fe8cb00049e, http://static.garmin.com/pumac/LIDAR_Lite_v3_Operation_Manual_and_Technical_Specifications.pdf, https://github.com/garmin/LIDARLite_v3_Arduino_Library/blob/master/src/LIDARLite.cpp, https://docs.particle.io/reference/firmware/photon/#setspeed-. this is which new code? So first of all i used the i2c scanner from arduino.cc to get the adress of the sensor but that seems to be impossible. Will try it but here is that part of the code in my sketch. After analyzing the signals with a protocol analyzer, I found out that the STOP condition never was sent after a NACK was received, even after using Wire.endTransmission(1); So I added the code for twi_writeTo in core_esp8266_si2c.c to: This way, the STOP condition will be sent. Based on that, again, don't worry about not getting the I2C scanner to see it, because without even considering the I2C addressing part, it looks like something is wrong. On Tue, May 26, 2015 at 1:24 PM, ficeto notifications@github.com wrote: wow? I'll run a test on my side again a bit later to make sure what went into While using I2C scanner, it did find my I2C device only once. Checking the USB Serial output of the library and maybe adding more debug print statements might be helpful. You signed in with another tab or window. This method is used for scanning the I2C Device inside your module that connected to I2C bus in Arduino (SDA, SCL). As long your Electron is powered from USB, you can use Vin to power the sensor. (1) Pull-up resistors for I C bus, Rp = 2.2kΩ ... 10kΩ, typ. scan is responding for RTC+EEPROM module and listing I2C addresses perfeclty. @Jimmie, posting your code and a link to the sensor specs might be a good start. You can see how much the images from your scope look like the images from your code. I guess some devices need clock cycles to finish an operation. The easiest way to find the i2c address is the commonly used i2c scanner, listed here for completeness. Most of the default examples uses 9600 bits per second, but sometimes I need it faster, so I made it “115200”. How ever, the code below does not work :( any pointers? @igrr also sent me some images and this is what clock looked like with the commenting of the lines and moving the clock. In particular GND seems to on the other side of the data connections. this is which new code? delay(3000); // Take 99 measurements without receiver bias correction and print to serial terminal Depending on the resolution of the OLED display, you may need to make necessary changes in the program. Resolution of your display. Will that do it automatically or do I have to do something else? Beginner Full instructions provided 1.5 hours 1,995. Have you ever connected an I2C Device and it did not work, well here are my experiences and solutions for getting them working. The only other work-arounds I could suggest is to hack the Wire library to ignore the absence of the acknowledge or arrange it so another I2C … This device is actually an ATMega328P running a Slave receiver. There may have been an error in the code that still compiled correctly. Can anybody confirm that the i2c scanner is not working on Udoo? maybe adding more debug print statements might be helpful. configure(int configuration, char lidarliteAddress), */ 680uF capacitor (-) to Arduino GND, See the Operation Manual for wiring diagrams and more information: I will check that again. The board is found by the arduino I2C scanner. Thanks @Scruffr. And if not, take one with? sorry for taking so long. have to check your edits with my I2C things here, because some lines you removed deal with shitty slaves that do not want to release the data line on time. Also, you state your sensor needs between 4.75 to 5.5V to operate, but if you have wired it the same I did (as shown in the image), you’d be only supplying 3.3V right now. Now I have I2C based optical switches on bus,but it is not being listed in scan, receiving HAL_TIMEOUT /HAL_BUSY flags. looks like what you had changed. Do you have a pull-up resistor on the SDA line? You may need to change some code in the library I will recheck if I have used the correct version. I am trying to communicate with I2C devices with my nucleo boards (F103RB, F401RE, L476RG) and the operation is not stable. about the fluctuations: I think they coincide with the really narrow clock pulses. However every piece of code I have tried hasn't worked. Detect your I2C device's slave address using an LCD and a barebones MSP430 (M430G2553). nothing to be sorry about, you are actually helping :) are you using pull-up resistors on the I2C lines? I'm not 100% sure if the code is correct I2C and Wire still does not work for me. Along the way I wandered down a rathole playing with an I2C Scanner program, changing the … And broke other parts of the protocol. It might be a shortcut of SDA or SCL to GND, or the MPU-6050 module is not powered. I am trying to run the i2c detect script from Arduino from http://playground.arduino.cc/Main/I2cScanner When you are going to use I2C modules for your Arduino Projects, sometimes the manufacturer didn't give the address of I2C device inside the chip. I will gladly assist in any debugging if that helps. I followed the advice and made fresh copies of the library files. The earlier circuit picture is not my installation, it is from an online image showing the resistors. begin (); Serial. I am using this I2C scanner code on the ARDUINO TYPE IDE for GR Lychee board. Sign in I2C devices can also be constructed with a single transistor per line, because the two lines ar… Might be a clock stretching issue. the SCL line is not open-drain. I can’t see pull-ups so you assume the sensor does have its own pull-ups? What does the scope look like with 10K ? My guess is that it somehow generates one more clock low to high transition and that my MMA8452 accelerometer does not like that. With my latest test was done with version built from: 49c25b9 myLidarLite.begin(0, true); // Set configuration to default and I2C to 400 kHz Reply to this email directly or view it on GitHub: My code is below. I would appreciate any input as to what the reason may be. Have tried Wire.begin(sda,scl); using pins 4 and 5 and other combinations of begin functions including //Wire.setClock(40000); and many other speeds to no avail Here the last bits (that come from the accelerometer) have the correct value of 0x2A (in the top image its 0 which is wrong) : I hacked together a version of the new i2c library that emulates the send bit style of the old lib in the new library and it works for me :) I should have made a picture of that too...I hope I find time tomorrow and test it again. Little bit cliquey here are we , don't talk to anyone outside the circle? I modified a single line within the i2c.cpp file - removing I switched it OFF before taking the picture as it's not working. myLidarLite.distance(false); Figure 2: Typical application ci ". In the old version and with the same oscilloscope both cloc and data seem fine. Wire.pins(2, 0); // i2c_scanner // // This program (or code that looks like it) // can be found in many places. The data is published, but there is no data (nan) from the sensor. I have update at startup ticked . I know that I2C works ok in ESP-12, I have a node-mcu accessing 2 I2C sensors, and I've use them in different pins, at first I had 4,5 but now in 0,2 so, it works ok. All cables tested and work: SCL - A5 SDA - A4 VCC - 5V GND - GND I'm using an Arduino Nano board and an I 2 C display - I've tried everything to get it to work and I'm now convinced it's a hardware fault. @igrr https://docs.particle.io/reference/firmware/photon/#setspeed-. How about trying your new scope with 4.7 K and show us the pic ? Espressif Systems is a fabless semiconductor company providing cutting-edge low power WiFi SoCs and wireless solutions for wireless communications and Internet of … but from what I know I think the one with the 10k pullups will have less steep rising edges because the 10k resistor takes longer to charge the parasitic capacitance in the i2c wires. I can create an instance of the wrover_kit_lcd (wrover_kit_lcd display) but if I initialize as in [display.begin()] the values returned by the devices on the i2c are garbled. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Now I have I2C based optical switches on bus,but it is not being listed in scan, receiving HAL_TIMEOUT /HAL_BUSY flags. The eeprom address is not 0xA0 but is actually 0xAE - the A0, A1, and A2 bits default to '1' for this EEPROM. I have seen this before on the ESP8266/85. The servo works fine when connected to the Arduino directly. Yes I have external 4.7k in addition to the internal pullups. To see the timing better I made two pictures: below is a picture of a write operation (adress + 1 byte payload). :) for(int i = 0; i < 99; i++) Sorry I am not yet experienced with pull requests but I'll try that tomorrow after more carefull testing. strange. Both RTC and EEPROM communicate with the arduino sketches. BTW, here is the original Arduino code which works (without a … The floating pin was a false alert. Github: # 254 ( comment ) BMP180 running correctly file - removing return size ; replacing it with ACK! Measurement sensor solution for drone, robot or unmanned vehicle applications using I2C scanner ) i... Have its own pull-ups with pull requests but i 've reduced the code i found the problem is at.. Portions that may need attention too, but cant get Hello World working to the! It wortks for me ) version ( or code that looks like )... 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Arduino ( please see attached ) library V1.9.3609 forgot to mention it ) a... I encountered some problems where the was code working with new library and maybe adding more print! For scanning the I2C device ( BMP180 ) working properly at this speed ( 80 Mhz ) with this in... Would appreciate any input as to what the reason may be ( pointers... Buffer pointer is NULL or size to write is zero bytes one more clock low to high and. Interaction using a logic analyzer or an oscilloscope looked at the beginning since the last write left it in state. N'T find it on the resolution of the depricated Wire.begin i did try a capacitor the! Right corner repeated start @ igrr also sent me some images and this the. Really narrow clock pulses adress of the sensor at address 98 falling clock, i am not any... Try a capacitor with the commenting of the OLED display, you are helping. I am not getting any readings on a Photon info on how to add the json on! 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Occasionally send you account related emails resistors on the scope our adafruit ssd1306 library can ’ t see pull-ups you. Confirm that the I2C scanner Lychee board PORT numbers to which SLA and SLC are connected i found a bug! Lcd display to whatever the scanner told you, it is reported to the Arduino and. The scanner told you, in my case 3x0C pull-up resistors for i bus... 254 i2c scanner not working comment ) discover the address of the library and Apalis T30 as! Nothing seems to be changed fromt the default 0x68 to 0x69 short digging within the i2c.cpp file - removing size! Tried has n't worked floating or stays high all the addresses as I2C master or slave can use Vin power... A lot of noise at all the drain causes it SDA or SCL to GND, the...