Tiny ESP32 board from the Kilobyte store on Tindie with optional battery header and pSRAM:
It’s a little ESP32 Board. Perfect for controlling or sensing stuff in the real world and sync it to the internet! Despite that it features the ESP32 WROVER Module. This means it got 4MB FLASH and 4MB RAM. That’s an absolute incredible amount of RAM. I honestly have no clue for what I will ever need 4MB in my embedded Projects.
Why did you make it?
I wanted a small ESP32 Board with the pSRAM and which works and doesn’t eat your whole time to get it working and find it’s issues and quirks.
I’ve used the CP2102 Serial converter because this is the one, which works the best way to program the ESP32. Even Espressif uses this serial converter on their own dev boards.
What makes it special?
It’s propably the smallest ESP32 Board with pSRAM. Despite the size it’s ideal for battery operation. It uses under 200uA in Deep Sleep mode!
Ben Strahan of Hologram.io writes about why development hardware should be open source:
It’s a simple premise – black boxes stifle innovation while open systems encourage exploration. Black Boxes and IP have their place as an essential tool in our economy; but in an industry like IoT where rapid innovation is needed, we need to push for open development tools as the building blocks that lead to innovative end-products for industry and consumers.
Going forward Hologram will open-source all hardware we develop for the developer community, including dependent firmware, through OSHWA. We see this as a mandatory step we need to take to help move IoT forward, to lower the barriers to entry, and to spur innovation in a rapidly evolving ecosystem.
The hardware design files for the new Hologram Nova module are available on GitHub:
Chip McClelland designed this Particle Electron carrier board to enhance the reliability and capabilities his outdoor IoT project:
Particle Electron Carrier for Outdoor IoT Applications
I have been building IoT sensors for outdoor use for a few years now. Most of my focus has been on helping local parks better count and report the cars, bikers, joggers and hikers which use their facilities each day. By giving them an accurate and automatic way to measure park utilization, They can save significant labor costs, get a more complete count and facilitate reporting. My hope is that this work will show how important our parks are and help preserve and even expand funding for these vital community resources.
Longer term, I also want to collect environmental and health data with these devices and I realized that a general purpose enhancement to the Particle Electron would be useful in all manner of applications that I – or the community – might dream up. This project, developed in collaboration with the Particle community (see Team link) is open source and available to anyone who can wants to deploy IoT devices where there is no WiFi or utility power.
These carriers have proved to be very reliable and have survived 6 months so far in the North Carolina Summer. I have started working on a Solar Implementation and have some ideas for future improvement. Please let me know if this is helpful and if you have any comments or suggestions that could help improve the carrier.
chipmc has shared the board on OSH Park:
If you’ve enjoyed Guillermo Amaral’s electronics projects such as the Canon DSLR WiFi Remote, Raspberry Pi PSU, UARTMatic 3000+, Keypad Submodule and many more, then please consider giving to his cancer treatment fund:
I’ve unfortunately had to flip the bill for my two past surgeries and my on going cancer treatment… and as you can imagine, I’m running out of cash.
If you like my content and/or have found my published projects interesting or useful, please consider sending me some spare change and I’ll be ever so grateful.
Here are couple great project videos by Guillermo on YouTube:
Kris Winer designed this is a small 4-layer PCB for remote logging of absolute position and orientation:
STM32L433-based board with CAM M8Q concurrent GNSS, EM7180 + MPU9250 + MS5637 for absolute orientation, and an ESP8285 for wifi connectivity.
The absolute orientation engine uses the MPU9250 accel/gyro/magnetometer IMU sensor plus the MS5637 barometer as slaves to an EM7180 motion co-processor that sends quaternions and drift-stabilized altitude to the host via I2C.
There is an Arduino library and sketch available on GitHub:
PeskyProducts has shared the board on OSH Park: