Collection of my personal projects in the Arduino IDE / ESP8266 world. I include code I've modified, written, and found to work. Prices are what I've paid on the open market.
KeeYees - $13.59 / 3 = $4.53ea - https://www.amazon.com/KeeYees-Internet-Development-Wireless-Compatible/dp/B07HF44GBT
Temperature & humidity readings POSTed to a local server at a frequent interval)
Temperature sensor - $13.99 / 10 = $1.40ea - https://www.amazon.com/KOOKYE-Temperature-Interface-Technology-DS18B201010/dp/B08C7N75ST
Temperature & Humidity sensor - $9.99 / 5 = $2.00ea - https://www.amazon.com/KeeYees-Temperature-Humidity-Single-Bus-Raspberry/dp/B07V5MTQJG
Display temperature probe readings onto a display
Display - $14.99 / 4 = $3.75ea - https://www.amazon.com/MakerFocus-Display-SSD1306-3-3V-5V-Arduino/dp/B01KNKTM2I
Temperature Probe - $12.99 / 5 = $2.60ea - https://www.amazon.com/Waterproof-Temperature-Thermistor-Controller-Thermometer/dp/B01JKVRVNI
Control a Heating & Cooling head unit which is normally controlled by remote
IR emitter & receiver - $5.98 / 10 = $0.60ea - https://www.amazon.com/Gikfun-Infrared-Emission-Receiver-Arduino/dp/B06XYNDRGF
Temperature sensor - $13.99 / 10 = $1.40ea - https://www.amazon.com/KOOKYE-Temperature-Interface-Technology-DS18B201010/dp/B08C7N75ST
AQI Sensor - $13.00ea - https://www.amazon.com/dp/B07B2PFPB5
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Schematics for each project
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Pictures of finished products
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Difficulty ratings
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Cost breakdowns and full estimated project costs
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Power consumption data
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Progress Updates after deployment
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Next Up list