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
Top view of the PCB with R.Pi contour
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
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The second version (here is larger 1st version with fixed angle) of R.Pi camera housing is smaller with 9 LEDs and possibility to adjust camera angle.
Adjustable housing with 9 LEDS for IR illumination
The 3D models are available on 3DcontentCentral or in GrabCad.
STL for 3D printing is on Thingiverse.
This is housing for R.Pi camera V2 with LED illumination.
It is 3D printable housing and PCB with 9 IR LEDs with enable.
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Here is scenario:
pushbutton is connected to Raspberry Pi GPIO pin. Whet button is pressed, R.pi calls remote URL.
This can be useful for many simple applications, like detecting and timestamping passes at certain location.
The R.pi should be up and running. Connect the pushbutton to free GPIO. In our example we connected the button to pin 11. The pin is configured with the pullup, which means the button must pull the GPIO pin to ground. Pin 12 on r.Pi model 2B (40 pin P1) is GND:
Ultra simple schematic for this example
Now prepare some simple script on your fancy web browser, which will be called when someone presses the button. Here is example, which simply adds one line with time and date at the end of the file “log.txt” every time when file is loaded:
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This is 5 minutes soldering project. There is no schematic, just simple circuit, something between “dead bug” and conventional PCB design. I did this in two steps. First attempt was complete failure. Local OM told me that any power mosfet can operate as power amplifier for HF. Ok, maybe not just any. I tested with couple of them including IRFZ24N. Finaly I took “proper” MOSFET for higher frequency and the circuit worked pretty good:
Simple output stage for QRSS beacon assembled in “mixed” technology
I will briefly describe this quick and simple project and I hope readers would enjoy it.
Continue reading ‘Simple HF amplifier for QRSS beacon’ »
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.
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Ina soldered today 16 leds in matrix and then we connected it to “LED Decoration” hardware. The basic idea was:
4×4 LED matrix Xmas tree
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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
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