Our Tesla M3 efficiency vs. outside temperature stats for the last 10K km driven, collected using TeslaMate. No surprises here, driving at 20 °C outside is most efficient
Our Tesla M3 efficiency vs. outside temperature stats for t…
Our Mitsubishi Ecodan heat pump’s COP vs outside temperature
Our Mitsubishi Ecodan heat pump’s COP vs outside temperature:
Wireless outdoor temperature sensor
Had to move a wireless outdoor temperature sensor I designed ages ago, noticed a memo inside I left for the future self with last battery change date. Still sending readings every minute since May 2018, thats 4 years and 9 months on couple AAs and still going strong. #IoT #rfm69
16°C outside temperature
16°C outside temperature right now
SAMD21’s internal temperature for sensorless room
SAMD21’s internal temperature seems pretty accurate to measure ambient temperature when on battery power/mostly sleeping. Experimenting with sensorless room temperature monitoring using #LoRaWAN
Low cost, battery powered temperature and humidity node
Thinking about creating a low cost, battery powered temperature and humidity #LoRaWAN #IoT node with always on LCD like this:
Low cost monochrome 7 segment LCD display
Dug up an old prototype of a low cost monochrome 7 segment LCD display + DS18B20 temperature sensor + Atmega328 + RFM69 433Mhz transceiver project. 30uA sleep current. e-paper is still relatively more expensive alternative. #IoT
13m³ pool water temperature just over 30°C
Our 13m³ pool water temperature reaching just over 30°C thanks to the DIY solar heater I blogged about last year https://harizanov.com/2018/07/diy-swimming-pool-solar-heater/ solar harvesting
Wireless battery temperature and humidity sensor revision
This is my latest wireless battery temperature and humidity sensor revision. It is optimized for long range (200m) and long life (2+ years sending once a minute). To be used with the display hub and relay actuator I tweeted recently #IoT #smarthome
Battery operated wireless temperature sensor node code
Heavily revised my old battery operated wireless temperature sensor node code, achieved 15% lower current consumption footprint.. #IoT
Using DS18B20/DHT22 temperature sensor with internal pull-up resistors rather than external ones
Testing a 4-line OneWire library change that lets the DS18B20 run off internal pull-ups – no more pesky external 4.7K resistor on SMD boards.
WiFi IoT 3 channel relay board with MQTT and HTTP API using ESP8266
My ESP8266 relay board: three solid state relays, MQTT + HTTP API, DHT22/DS18B20 sensor support – an open WiFi IoT switching platform.
ESP8266 powered web server + LED control + DHT22 temperature/humidity sensor reading
An early ESP8266 experiment: web server, LED control and DHT22 temperature/humidity readings on the $4.50 Wi-Fi chip that shook up DIY IoT.
CR2032 battery discharge pattern
9 months and 10 days on one CR2032: the discharge pattern of a coin cell powering a Funky v1 + DS18B20 room temperature node.
Wireless body temperature monitor/logger
A wearable wireless body temperature monitor for sick kids – remote logging plus a bedside status display with an alarm.
OLED analog clock
Adding an analog clock face to my OLED status display, plus a bitmap thermometer tracking the solar water tank temperature.
Temperature to color encoding for visual status display using RGB LED
Encoding temperature as RGB LED color – read the solar hot water status from across the room, no display needed.
Optimizing DS18B20 code for low power applications
Cutting the DS18B20’s 750ms conversion time by dropping resolution – optimizing the sensor code for low power battery nodes.
7 months of sending and still going
7 months on the same CR2032 and the Funky+DS18B20 room temperature node is still transmitting – live chart included.
Using my 1.8 TFT as a Raspberry Pi status display
Turning my 1.8″ TFT into a Raspberry Pi status display showing house telemetry pulled from emonCMS.
Funky as remote temperature sensing node with DS18B20
Using the Funky as a remote room temperature node – a DS18B20 solders straight onto its pads, one per room before the heating season.
Measuring humidity and temperature with DHT22 and Funky
The DHT11 turned out to be a bad joke, so I upgraded to the DHT22 for outside temperature/humidity feeding my heating automation.
Using ATtiny 84’s internal temperature sensor
Reading the ATtiny84’s internal temperature sensor – no external parts, quite nice for a really low power node.
Using a cheap digital thermometer’s LCD display
Reusing a cheap digital thermometer’s LCD by mimicking its thermistor with a digital potentiometer – a free data display.
Tiny Sensor plans
TinySensor plans: the ATtiny84 remote sensor goes to a real PCB fab – CR2032 slot, a JeeLabs compatible port, 15 boards minimum.
Using the Sensing Shield for logging solar hot water tank temperatures to Pachube
An expandable solar hot water tank temperature logger to Pachube on the Sensing Shield – built for a forum guy new to Arduino.
Single sided ATtiny84 temperature sensor PCB
A single sided ATtiny84 temperature sensor PCB after the double-sided fiasco – etches cleanly, sends every 60 seconds.
Home made PCB for the remote temperature sensor
My first home-made PCB: toner transfer and ferric chloride etching for the remote temperature sensor board – faster than any fab house.
The ATtiny84 remote sensor gets and upgrade from single analog to multiple digital temperature sensors
The TMP36 tops out at 57°C on the ATtiny84’s 1.1V reference, so the solar tank sensor moves to multiple DS18B20s on one wire.
ATtiny84 remote temperature sensor with RFM12B
An ATtiny84 remote temperature sensor with RFM12B – JeeNode Micro envy turned into my own single-chip wireless node.