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1500 questions
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Is my Arduino possibly broken?

We work in groups on a project at school. We had to build an electric scheme with an Arduino to make a small car moving. We got the parts from our school, except the Arduino (we had to buy it ourselves). We had to use a battery of 11.5 V. We also…
user28055
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HC-0# Bluetooth module questions

I've been playing with the HC-06 BT module lately, but now I want to do more with it and I'm not sure how to. I was wondering if it's possible to get signal strength from the module, or would I have to purchase another HC-0# module to do so? Also…
Sam W
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How can I play music using a speaker and Micro SD card Module?

I am trying to play music using my Arduino and micro SD card module but can't seem to do it. Can anyone shed some light on this? The SD card module I'm using is a Catalex sainsmart micro SD card module. It has the outputs VCC, GND, MISO, MOSI, CS,…
Joe Bob
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How to display an entire incoming string from the serial monitor in arduino ide?

this is my first question in this forum. I need to receive a string from the Arduino serial monitor and display it when the communication is over. I have a similar problem like the one discussed in this…
Daniel Maydana
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why there is 4 ground in l293d?

I am using L293d motor driver to drive 2 motors simutaniusly in several direction. But I am not shure why there is 2 Vcc and 4 GND in this IC. Can anyone tell explain it? Thank You...
shajib0o
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Mini Voice Recorder for Arduino

I am trying to find a small voice recorder that I can use with my Arduino Micro, and I found this. It is exactly what I am looking for, but it is now a retired product. I googled ISD1932, but many other sites are out of stock or not selling it…
Nobody
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How to connect an Arduino Micro to MPU-6050

So I'm trying to connect my Arduino micro to the MPU-6050. I was using this tutorial: https://diyhacking.com/arduino-mpu-6050-imu-sensor-tutorial/ This tutorial worked with my Arduino Uno but not the Micro. When I try to run the Serial Monitor it…
Eduardo Cunha
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How do I hook up a 3V device to a 74AHCT125 (Quad Level-Shifter)?

I have this level shifter that I'm trying to feed a 5V power source and then hook up a 3V device. I've got the 5V source hooked up fine (on the top pinouts), but having trouble figuring what the "power out" would be that's 3V. Here's the data…
Shpigford
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Can Atmel Studio 6 Simulator simulate SPI?

I am trying to do PAL composite video output with Arduino Nano. I am using Atmel Studio 6, not the Arduino IDE. I am sending out the picture data via SPI. On the TV I could not see the text I tried to produce, so I tried to run my program in the…
szali
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Binary message formatter

I am currently developing an IoT device with arduino and i want to minimise the data payload. First i used json which is not very efficent in fixed messages (the format will always be the same). Then i found something like messagepack which also…
perotom
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How do I change the I2C address on the LCD backpack?

The 20 x 4 LCD comes with a I2C backpack. I know it has A0, A1, A2 to set the address, as shown at the bottom here: https://tronixlabs.com.au/news/tutorial-serial-i2c-backpack-for-hd44780compatible-lcd-modules-with-arduino/ It points to here: …
SDsolar
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Methods to prevent Accelerometer values changing from current spikes

I've connected an Arduino Uno to a MAX7219 IC, which is connected to only one standard 8x8 LED matrix, and an ADXL355 3-axis accelerometer. I use the matrix initially, and turn on all LEDs, while taking the "rest" values for the accelerometer to…
naiveai
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Where to connect BLK and GRN pins of Openlog board on my Uno?

I have the following SD card reader on the left side from Sparkfun. In the tutorial they have it connected directly into an Arduino Mini, which has BLK and GRN pins> I would like to connect it to an Arduino UNO. Where do I connect these pins or can…
Lightsout
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ESP01 connected to Arduino can't read from UART while connected from external power source

I have an Arduino Uno connected to a NodeMCU ESP01 module, communicating via serial pins. The NodeMCU is powered from the Arduino's 3.3V pin. My idea is that the ESP01 receives MQTT messages, sends them to the Arduino via serial and wait for the…
n0hepe
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I2C connection freezes Master if Slave disconnects

I am using I2C to successfully request critical data from a Slave device (I have to use requestFrom() in the Master) but if, for some reason, the power disconnects from the Slave device then the Master freezes altogether. I didn't realise I2C was so…
Daryl
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