Adafruit_Sensor
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Adafruit_Sensor | Arduino-Libs | |
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6 | 2 | |
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Apache License 2.0 | GNU General Public License v3.0 or later |
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Adafruit_Sensor
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Need help with DHT22. If the temperature reaches below 0.00C I get a value of -3276.70C. Code in description and more info.
GitHub - adafruit/Adafruit_Sensor: Common sensor library
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Why does it say "Failed to read from DHT sensor!" ill post the code down in the commments
// REQUIRES the following Arduino libraries: // - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library // - Adafruit Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor
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A confusing issue with NodeMCU
// Example testing sketch for various DHT humidity/temperature sensors // Written by ladyada, public domain // REQUIRES the following Arduino libraries: // - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library // - Adafruit Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor #include "DHT.h" #define DHTPIN 4 // Digital pin connected to the DHT sensor // Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 -- // Pin 15 can work but DHT must be disconnected during program upload. // Uncomment whatever type you're using! #define DHTTYPE DHT11 // DHT 11 //#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321 //#define DHTTYPE DHT21 // DHT 21 (AM2301) // Connect pin 1 (on the left) of the sensor to +5V // NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1 // to 3.3V instead of 5V! // Connect pin 2 of the sensor to whatever your DHTPIN is // Connect pin 3 (on the right) of the sensor to GROUND (if your sensor has 3 pins) // Connect pin 4 (on the right) of the sensor to GROUND and leave the pin 3 EMPTY (if your sensor has 4 pins) // Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor // Initialize DHT sensor. // Note that older versions of this library took an optional third parameter to // tweak the timings for faster processors. This parameter is no longer needed // as the current DHT reading algorithm adjusts itself to work on faster procs. DHT dht(DHTPIN, DHTTYPE); void setup() { delay(2000); Serial.begin(115200); delay(2000); Serial.println(F("DHTxx test!")); dht.begin(); } void loop() { // Wait a few seconds between measurements. delay(2000); // Reading temperature or humidity takes about 250 milliseconds! // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor) float h = dht.readHumidity(); // Read temperature as Celsius (the default) float t = dht.readTemperature(); // Read temperature as Fahrenheit (isFahrenheit = true) float f = dht.readTemperature(true); // Check if any reads failed and exit early (to try again). if (isnan(h) || isnan(t) || isnan(f)) { Serial.println(F("Failed to read from DHT sensor!")); return; } // Compute heat index in Fahrenheit (the default) float hif = dht.computeHeatIndex(f, h); // Compute heat index in Celsius (isFahreheit = false) float hic = dht.computeHeatIndex(t, h, false); Serial.print(F("Humidity: ")); Serial.print(h); Serial.print(F("% Temperature: ")); Serial.print(t); Serial.print(F("°C ")); Serial.print(f); Serial.print(F("°F Heat index: ")); Serial.print(hic); Serial.print(F("°C ")); Serial.print(hif); Serial.println(F("°F")); }
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The code I attached below is working for esp32 but not working onesp8266
#include //DHT and Adafruit Sensor library(https://github.com/adafruit/Adafruit_Sensor)
Arduino-Libs
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Path forward from Arduino to embedded C/C++
There are some design decisions Arduino made that maybe restrict in one aspect, but there's nothing wrong with dropping down to a lower level or jumping sideways to a slightly customized version that does just the right thing. e.g. If digitalWrite() isn't fast enough, somebody wrote a digitalWriteFast() that works with some AVRs. Otherwise, you can probably just hunt down the source yourself, make your own copy of it, and change it to be the way you need. That's a great way to learn, too
What are some alternatives?
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TLE5012-Magnetic-Angle-Sensor - This repository includes an library for Arduino for the TLE5012 Magnetic Angle Sensor with SSC interface.
DHT-sensor-library - Arduino library for DHT11, DHT22, etc Temperature & Humidity Sensors
PZEM-004T-v30 - Arduino library for the Updated PZEM-004T v3.0 Power and Energy meter
vzlogger - Logging utility for various meters & sensors
ArduinoXInput - XInput library for USB capable Arduino boards
ModuleInterface - Easy config and value sync between IoT modules, database and web pages
MD_MAX72XX - LED Matrix Library
SparkFun_MLX90640_Arduino_Example - Controlling and reading from the MLX90640 IR array thermal imaging sensor
CoopCommand - CoopCommand aims to increase automation in small scale egg-laying chicken flocks for the hobby farmer. Final product aims to have ease of installation and use for non-technical users.
Ticker - Ticker library for Arduino