Unanswered Questions
205 questions with no upvoted or accepted answers
5
votes
0
answers
419
views
DHT22 reading weird values
I just hooked up a DHT22 I had laying around in a parts drawer to test something and it is giving out some crazy wrong values, I am running the adafruit library's unified example and this is the ...
- 19
4
votes
0
answers
471
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Problem in using COZIR W-100 with arduino
I was using the COZIR W-100 carbon dioxide sensor with an Arduino Mega 2560 with the example code from this site.
But the measured value of carbon dioxide by sensor was 90 ppm in fresh air and that ...
3
votes
0
answers
227
views
Using 2 VL53L4CD ToF sensors and getting error after getting first reading
pretty new to arduino stuff and was hoping to get some help with my code.
I'm trying to use 2 ToF sensors and get continuous readings from them. I understand that I have to use the xshut feature and ...
- 31
3
votes
0
answers
490
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Integration of MAX30100 and DS18B20 Thermal Probe Integration
This is for my final year project that I have been tasked with designing a patient monitoring system. However, during the last stretch of model prototyping, I am experiencing issues with my MAX30100 ...
3
votes
0
answers
282
views
SHT30 giving wrong humidity
I have an SHT30 sensor which is feeding to my Arduino via an RS485 connection. The readings are coming in as they should be for both temperature and humidity. The problem, however, is that the ...
- 131
3
votes
1
answer
6k
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Read temperature (DS18B20) with the ATTiny85
I'm trying to read the temperature of a DS18B20 with my ATTiny85 - but I'm getting rubbish data :D
I should have gotten ~22 degrees, but I'm getting 129! I followed this tutorial i found here, but ...
CommunityBot
- 1
2
votes
0
answers
103
views
Slow I2C communication
To collect temperature and BPM, I connected a max30101 in my Heltec WiFi kit V3 with ESP32. The data collected are stored in arrays to extract statistical features from signals which an algorithm will ...
- 31
2
votes
0
answers
498
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MAX30102 doesnt show data when it's interfacing with other sensors MLX90614 and MPU6050
The hardware I am using is ESP32 with MAX30102, MLX90614 and MPU6050 sensors and Using Blynk to show my data from the sensors. The issue I am facing is when I ran the code with all three sensors only ...
- 21
2
votes
1
answer
121
views
How to get Bpm with 4 heart beat pulses
I'm trying to get an average from three intervals to get bpm. However, when I use the code below the bpm would slowly decrease when used with the sensor. Can anyone please check for what is wrong with ...
- 59
2
votes
0
answers
179
views
SPI problem with Bitcraze PMW3901 sensors and Arduino NANO
I am currently trying to connect four Bitcraze PMW3901 sensors to an Arduino NANO, but I seem to have issues with the SPI. When I connect two sensors using the code below, it works perfectly: I am ...
- 21
2
votes
0
answers
328
views
Strain Gauge with HX711 Load Cell Amp
I am trying to get a strain gauge working with the HX711 load cell amp. I posted about this a few months ago and got told to get some high precision resistors for the wheatstone bridge. I have now ...
- 1,795
2
votes
0
answers
159
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Why doesn't LCD 16x2 work with fingerprint sensor code?
When I separate fingerprint code and LCD code it works fine. sensor read 6 templates which I already stored 6 fingers ID. When I combine the code it read 0 templates.
#include <Adafruit_Fingerprint....
2
votes
0
answers
270
views
Two sensors on same ESP-32 board
Need some help on the project I'm currently developing.
I have 3 YF-B2 sensors that I need to connect to the same ESP-32 board and read the data from the sensors and send it via MQTT.
I had it working ...
- 21
2
votes
0
answers
841
views
How to Adjust MQ131 Sensor?
The problem
Hey. I'm trying to use the sensor Mq131 to measure some ozone data in a closed environment, but I'm having some bad time to adjust the trim in the sensor and get results in ppb. By ...
- 121
2
votes
0
answers
410
views
Error compiling for board Arduino Nano 33 BLE
I am trying to use pulse sensor with Arduino Nano 33 BLE sense, but when I verify it, it shows Error compiling for board Arduino Nano 33 BLE. The code is from the pulse sensor website. The code works ...
