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Today I am going to show you how to make a very cool LED keychain. To do this, we are going to use an ATtiny to make the LEDs blink and fade. This is going to help us to learn how to solder SMD components and also how to program an ATtiny.
You can also find the code here in case you want to modify it or even create a new one! This code has 4 modes: All on, slow blink, fade and fast blink that change every time we press the button and then it enters in sleep mode to save battery.
Once we have finished, we can carry our creation around with our keys as a keychain!
I’m building a suite of arcane tech tools that make everyday electronics tasks more beautiful. This one came out so nicely that the final version has a hole for an earring hoo
I’ve built a couple of ESP8266 programming jigs based on this in the past, and while they usually worked, sometimes there’d be issues attributable to loose wires, or other causes that would take ages to debug. So, when I decided to play with the ESP-01 module again, it was a no-brainer to design a PCB version.
Given the “ESP” naming of Espressif modules, I thought it’d be fun to make it in the shape of an Ouija-style talking board planchette.
Many development boards feature a plethora of sensor types intended for prototyping an IoT device. Among those types are generally one sound sensor and one vibration sensor. Kris Winer, a one-person maker shop, is developing a purpose-specific sensor board containing multiple types of the same sensors. That board is Mothra, an acoustics laboratory on a stick.
The difference Mothra offers over traditional “all-in-one” sensor boards is that it only has two types of sensors: microphone and accelerometer. However, it has two of each, giving the board high sensitivity and offering very low-power sleep modes where either type of event can wake the microcontroller.
For the microcontroller module, Winer is using the STMicroelectronics BLE-enabled STM32WB. This module contains two microcontroller cores and a Bluetooth Low Energy radio. We hesitate to say “dual-core” because the cores are not at parity. One is an Arm Cortex-M0+ running at 32 MHz focused on BLE operations. While the other is an Arm Cortex-M4F running at 64 MHz and intended as the application processor. The module has 1 Mbyte flash, 256 kByte SRAM, and 68 GPIO pins. However, Mothra’s design uses 52 of those pins. The board breaks out eight digital I/O, two analog pins, and access to I2C.
There’s always a story behind every project ever completed, and although this one started nearly 2 and a half years ago, I don’t feel that the most relevant side of this project was ever told. This was partially my fault with the original video I made to showcase it, as it really didn’t go into detail at all about what this actually was, why it was (self-proclaimed) the first one in the world and why there are likely to be no more ever made.
A short update about the progress with the sensor panel and photos of the final input panel board. I assembled the new boards and are testing the sensors. As soon as all tests are done, and I am happy with the results and the board’s design, I will write the next part. These are 940nm…
The glasses are made out of printed circuit boards from OSH Park. The electronics driving the two displays are entirely on the right side stem of the glasses along with a small 100mAh rechargeable battery that will run the glasses for a little more than an hour. The left side stem is the same PCB, just unpopulated.
The Open Hardware Summit is the annual conference organized by the Open Source Hardware Association a 501(c)(3) not for profit charity. It is the world’s first comprehensive conference on open hardware; a venue and community in which we discuss and draw attention to the rapidly growing Open Source Hardware movement.
Speakers include world renowned leaders from industry, academia, the arts and maker community. Talks cover a wide range of subjects from electronics, mechanics to related fields such as digital fabrication, fashion technology, self-quantification devices, and IP law. As a microcosm of the Open Source Hardware community, the Summit provides an annual friendly forum for the community. For over five years we have had an established fellowship which supports travel and admission for women and other minorities as well as hardship tickets for low income individuals. The Open Hardware Summit was founded in 2010 by Alicia Gibb and Ayah Bdeir with support from Peter Semmelhack and Bug Labs in its founding years. Read more about the history of the organization and feel free to contact us with any questions.
Physical access to electronics generally means all bets are off when it comes to information security. But in special cases this is just unacceptable and a better solution must be found. Consider the encryption keys used by point of sale machines. To protect them, the devices incorporate anti-tamper mechanisms that will wipe the keys from memory if the device is opened. One such technique is to use a mesh of traces on a circuit board that are monitored for any changes in resistance or capacitance. [Sebastian Götte] has been researching in this area and wrote a KiCad plugin to automatically generate tamper-detection mesh.