Project Musings

The Works of Steven Green

Assembly of version 1.1 of IoT sensor

I completed assembly of V1.1 of the sensor board. This version revised the power circuitry.

I applied techniques learned from the first version's assembly.

I placed the BGA power IC first. A thin layer of flux was applied to fix it to the board. Then the remaining SMT parts were placed. The boar...

Design of version 1.1 of my IoT sensor

I got cocky with the second step in my temperature sensor project, IoT Plan.

I assumed I finished the design of the power circuit, in retrospect I must have set it down to return to later. I did not connect all the required pins for the power IC and designed a new version. Hopefully the next tim...

Fabricating my first temperature sensor board.

I have fabricated a wifi temperature sensor for my IoT project, IoT Plan.

The sensor board uses an ESP32 module for its core functionality: controller, wifi and temperature sensor. I paired it with a buck-boost voltage regulator that can be supplied by battery (3V) or micro-usb (5V) source. A 4-...

We live in a house built in the 60's, and we close off some rooms we rarely use to conserve energy. This year we have been tracking temperatures due to the installation of a new heating system. Wanting to collect more detailed measurements, I am creating a sensor network to collect temperatures auto...

Electronic measurement experiment continues

Inspired by the short-comings of my first locked-in amplifier experiment, this is my plan to revisit the subject.

My main oversight in the first experiment was not quantifying the difference between measurements, both with and without noise, and to what degree the noise would have influenced out...

Electronic measurement experiment

Derived from Microchip’s AN1115 application note, this experiment implemented a locked-in amplifier circuit and C firmware running on a microcontroller to measure a resistance.

Initially implemented by Microchip using a dsPIC, I ported the logic to a PIC32 running on an Explorer 16 Development ...