I2C on NANO pins? - Programming Questions - Arduino Forum
2016年1月7日 · I am having trouble with the NANO I2C Wire library. Right now I am running in circles. With the answers to the following 3 questions, I believe I can make progress. Note: I am using a genuine Arduino Nano V3.0 and the standard Wire library. I have found a document showing the I2C pins on Arduino NANO as A4 and A5 and another says they are D4 and D5. Three questions: I need a definitive answer ...
Defining SCL and SDA pins on NANO - Arduino Forum
2021年7月2日 · HI Guys. I am teaching myself I2C. I am using a NANO as a MASTER to control a Pro-Mini. The Pro-Mini is the SLAVE. The Pro-Mini needs to just blink an LED. A) Do I need to define pins 18 and 19 on the NANO as SDA and SCL respectively? If yes, then should I put the following in void setup() ? #define SCL 19 #define SDA 18 B) If I dont need to define the pins as SDA and SCL respectively, how ...
which pins should i take for i2c on arduino uno - Stack Overflow
2017年2月3日 · To make it easier to make shields which use I2C the manufacturer added the SDA/SCL pins in a known location. For both boards they are connected to the correct pins for that board. A similar remark applies to the later versions of the Mega2560 board. You can use either pins: the ones marked SDA/SCL or the appropriate pins for the board to hand.
Changing Wire library's Hardware I2C pins for custom arduino
2019年8月20日 · I am trying to change the wires i2c pins to 11,12 (SDA, SCL). I built my own PCB but do not have the i2c lines in the same location. I used adafruits feather52 bootloader. I found online that changing the variant.h file changes the i2c lines, but I don't have that file on my computer (PC), although my mac does.
Arduino Nano v3.0 - i2c problem - Sensors - Arduino Forum
2014年5月30日 · Hello, I`m trying to make i2c working on my Arduino nano v3.0 (with a Gravitech.us text on it) bought from ebay (some cheap china clone). The problem I have is that any call to the Wire.endTransmission() freezes the arduino. I know that this is a "common problem" of Wire library because there are no timeouts in the loops inside. Im using the latest IDE so the address shifting should be fixe ...
I2C with internal pullups - Arduino Forum
2015年12月31日 · The two lines SCL and SDA are driven by open drain drivers with slew rate control and read with spike filter. I guess the GPIO pins aren't used to determine bus arbitration, since there is a module called arbitration detection. So I think Koepel is right about reading even analog values while I2C hardware is outputting on these two pins.
Connect more then one I2C devices Arduino Nano
2021年12月23日 · There are 2 dedicated pins for SDA and SCL GPIO (One for SDA and one for SCL) in Arduino nano. how to connect more than one I2C Devices to Arduino nano? Like, I have to connect one I2C OLED display and one BME280 I2C sensor.
SDA and SCL not analog pins - Project Guidance - Arduino Forum
2021年11月7日 · I thought that the Nano was more or less obsolete, with only clones available, but it does still show as for sale on the Arduino site. However, the documentation on the site says: "I2C: A4 (SDA) and A5 (SCL). Support I2C (TWI) communication using the Wire library (documentation on the Wiring website)." And the pinout diagram doesn't show SDA and SCL at all. I finally found ONE website (not ...
Using A4/A5 as analog pins parallel with SCL/SDA pins for I2C with ...
2024年1月5日 · You can use an Arduino NANO (Fig-1) which has 8 analog channels; you use A0 - A3, A6-A7 for your analog sensors and use A4 (SDA)/A5 (SCL) lines as I2C Bus for HMC5883L sensor. Arduino NANO is the same as Arduino UNO but of smaller form factor and extra two ADC channels. This is an idea which I never tried, but I am testing now and it works ...
I2C bus count on Nano ESP32 - Arduino Forum
2023年8月31日 · The ESP32-S3 has two I2C controllers. The Nano ESP32 tech spec mentions only one I2C bus. The cheat sheet refers to "re-assign" pins according to Espressif docs. Two I2C buses would be better than one. (... due to pullup problems and identical i2c addresses...) Anyone out there already tried to use both I2C buses?