CO2, temperature and humidity monitor
https://www.electronics-lab.com/co2-temperature-humidity-monitor/
An open source CO2 monitoring project from Roving Dynamics: The project described below uses a MH-Z16 or MH-Z19 CO2 sensor and a DHT-22 (or DHT-11 if less accuracy is required) to measure the Temperature and Humidity. It has a 4 line by 20 character LCD Display to show the current readings and status, a warning alarm […]
30A, PCB-level supply monitor has integrated 300 microΩ sense resistor
https://www.electronics-lab.com/30a-pcb-level-supply-monitor-integrated-300-%c2%b5%cf%89-sense-resistor/
Designed to simplify board-level energy measurements, the LTC2947 power and energy monitor for 0V to 15V DC supply rails eliminates the need for an external sense resistor to measure current. by Graham Prophet @ edn-europe.com Choosing a sense resistor, Linear says, is not an easy task, especially when dealing with high currents, where available sense […]
Sunburn Monitor – A UV monitor
https://www.electronics-lab.com/sunburn-monitor-sound-base-indication-uv-monitor/
Sunburn Monitor is a UV monitor with sound-based indication. It calculates the max sun exposure before sunburn based on your skin type. The project was published over hackaday.io by [Quarterturn]. It’s based around SI1132 light sensor from Silicon Labs. SI1132 is a UV index and ambient light sensor with I2C interface and it’s available in […]
Low-side I/V sensing IC, with internal power calculation
https://www.electronics-lab.com/low-side-iv-sensing-ic-internal-power-calculation/
Maxim Integrated has posted details of the MAX44299, a low-side current, voltage, and power monitoring circuit that provides an analogue output current proportional to the measured current, voltage, and the internally calculated instantaneous power. The power monitor offers high precision and integration in tiny size. Instantaneous power is calculated internally by multiplying the load current […]
Automatic monitor brightness controller
https://www.electronics-lab.com/automatic-monitor-brightness-controller/
Dilshan Jayakody build a auto monitor brightness controller that adjusts your monitor brightness according to lighting conditions. He writes: The sensor unit of this system is build around PIC18F2550 8-bit microcontroller. To measure the light level we use LDR with MCU’s inbuilt ADC. The control software of this unit is design to work with Microsoft […]
Hacking a Blood Pressure Monitor
https://www.electronics-lab.com/hacking-a-blood-pressure-monitor/
by Eduardo @ edusteinhorst.com: I’ve been meaning to hack my blood pressure monitor for a while, and I finally got around to doing it! So, the idea is to mod a regular electronic blood pressure monitor to make it wireless and connected to the Internet, much like iHealth BP5 or Withings’. That makes detecting trends in your […]
LTC4282 – High Current Hot Swap Controller with I2C Compatible Monitoring
https://www.electronics-lab.com/ltc4282-high-current-hot-swap-controller-with-i2c-compatible-monitoring/
The LTC4282 is an energy monitoring Hot Swap controller with dual MOSFET drive to enable 100A and higher current board designs. The LTC4282 ensures safe board insertion and removal from live 2.9V to 33V backplanes by controlling external Nchannel MOSFETs to gently power up capacitors, avoiding sparks, connector damage and system glitches. High current […]
Raspberry PI answers, “Is the internet up?”
https://www.electronics-lab.com/raspberry-pi-answers-is-the-internet-up/
whiskeytangohotel.com has build a internet monitoring device based on Raspberry Pi: It is a pretty commonly uttered question (sometimes loudly) around the home or office; “Is the internet up?” As the goto IT Support Manager around the house this can get a little tiresome. Most of the time the internet is up and it’s a […]
ESP8266 MQTT battery monitor project
https://www.electronics-lab.com/esp8266-mqtt-battery-monitor-project/
Steve’s latest project, a wireless MQTT battery monitor: This board uses an ESP8266 (ESP12), a Texas Instruments INA226 I2C voltage and current monitor, and a Texas Instruments LMR12010X buck converter. This board is designed to wirelessly monitor 12 volt batteries and power supplies using an external current shunt resistor. The voltage across the shunt resistor […]