Archive for the ‘Periphery’ Category.
This is Raspberry Pi GPIO connector breakout board with some additional features:
- “Real” or “passive” PoE with 12V output
- 5V DC/DC module
- Additional 3,3V regulator
- ESD protection on all GPIO pins
- two additional pins for each pin on R.Pi 40 pin GPIO connector
- Separate UART and I2C headers
- 3,3V Supply for periphery is selectable: from R.Pi or from external regulator
- STM32F070 or similar in TSSOP-20 housing for controlling additional sensor or any other hardware
- Jumper for Cortex-M0 / R.Pi UART connection
Continue reading ‘Raspberry Pi breakout board with ESD, PoE and Cortex M0’ »
The Pressure, temperature and humidity sensor based on MS5637 HDC1080 originally (Rev. 2) operates via RS485 interface and multidrop HDLC-like protocol. I decided to simplify this for use with Raspberry Pi, arduion or any other mass platforms. First, I took away the RS485 transceiver and second, I simplified the communication.
First adaptation was easy:
Remove RS485 driver and connect Rx/Tx to A/B
Continue reading ‘Simple Rh, T and p sensor with UART communication’ »
Gal ordered some PCBs from PCB-Way a while ago. It was multiproject panel with several PCBs. One of the modules was double sided revision of the Pressure, temperature and humidity sensor based on MS5637 HDC1080 which was posted while ago.
Pressure, temperature and humidity sensor based on MS5637 HDC1080
Continue reading ‘Pressure, temperature and humidity sensor based on MS5637 HDC1080 Rev.2’ »
Once finished (deadline is end of January) this project will become open-source software and hardware.
My quadruple BDC driver for supports up to 4 brushed motors with encoders. Each motor is controlled by its individual closed loop and individual PID gain settings. Additionally, motor speed can also be individually addressed. Analog part of the driver is based on DRV8701P predriver and is controlled by STM32F4 microcontroller.
Continue reading ‘Quadruple BDC motor driver for robotics’ »
This LED decoration is for beginners in microcontroller applications. It has 8 LEDs, audio generator and possibility to interconnect with other modules. The PCB is simplified to certain level in order to be manufacturable on a single sided substrate with minimum effort. There are only two wire bridges and one 0 ohm resistor in addition to other components. The LED decoration can be used in school projects or for new-years fun. Of course it’s not limited to X-mas tree. It can be used during Bodhi Day, Hanukkah, Id al-Adha, Winter Solstice celebration, Saturnalia, Yule, Kwanza, Omisoka or any other occasion which might come at the end of the year, when day is short and some LED blinking device might rise your mood.
The concept of this LED decoration:
LED decoration concept
Continue reading ‘LED decoration’ »
I recently received 1m of APA102C led strip with 144 leds per meter. I want to use the strip for rotary POV display so I cut the strip in half and tested the performance with a STM32L476RGT nucleo board. The results of the tests are surprising and very promising for my application.
Continue reading ‘APA102C LED strip at 28 MHz clock’ »
Our home vineyard delivers about 1000 liters of wine every year. It takes some effort to keep good quality and pleasure for all friends tasting the must, new wine and “senior” wine reserves. One of the most important tasks in wine quality management is controlling the biological and chemical state of the wine. The wine can be monitored in special laboratory or in home lab. Of course home lab become rational when quantity of the wine is high enough to justify expenses in special equipment. There is some low cost equipment available for wine analysis, mostly with titration techniques, but chemical lab equipment is rather expensive and many hobby wineries avoid buying such equipment. I hope this post can contribute a bit to change that. I will describe the development of simple pH meter in detail.
Continue reading ‘Affordable pH meter’ »
USB/RS485 module on a single sided board worked successfully for several months. The code is now stable and I decided to order small batch of double sided PCBs for this project. Here is documentation:
RS485/USB interface on a double sided board
Continue reading ‘USB/RS485 converter on a double sided PCB’ »
Light Emitting Dance shades – general purpose party accessory.
LED Shades v0.3
About this project
I believe many young adults like to party and with the rapidly growing EDM community a lot of people attend parties with electronic music. I am one of them and you can probably tell where I got the idea to make the LED shades. Projects like this one don’t just keep me occupied in my free time but are also designed to broaden my knowledge in electronics and programming. Continue reading ‘LED shades’ »