Every Tuesday we give away two coupons for the free PCB drawer via Twitter. This post was announced on Twitter, and in 24 hours we’ll send coupon codes to two random retweeters. Don’t forget there’s free PCBs three times a every week: Hate Twitter and Facebook? Free PCB Sunday is the classic PCB giveaway. Catch […]
Author Archives: DP
Building a single pixel scanner
Kerry Wong published a new build: A flat bed scanner typically uses three rows of CCD sensors (RGB) to capture images placed directly on top of the glass bed. When the CCD array scans from one end of the image to the other, the digitized color image is formed. So with a similar approach, we […]
Free PCB Sunday: Pick your PCB
We go through a lot of prototype PCBs, and end up with lots of extras that we’ll never use. Every Sunday we give away a few PCBs from one of our past or future projects, or a related prototype. Our PCBs are made through Seeed Studio’s Fusion board service. This week two random commenters will […]
App note: USB Type C, CC Pin design considerations, high voltage design considerations for Type-C connector pins in systems supporting non-USB standard charging protocol and/or fault cases
Another app note from Fairchild Semiconductors on USB Type C to USB legacy design considerations. Link here (PDF) When designing hardware systems with type C connectors, a designer also has to consider all legacy, standard, and nonstandard specifications that exist in the USB connector eco system. With the introduction of the Type C connector and […]
App note: USB Type-C design considerations, USB Type-C adapters
Type-C USB cable adapter design consideration app note from Fairchild Semiconductors. Link here (PDF) USB is a ubiquitous connector that is used by many customers and in many different applications. With the official release of the USB Type-C connector, many companies are racing to implement this new connector and the supporting infrastructure. The early adopters […]
Controlling speakers with RADAR
Speaker power controller made with a RADAR module from Scott Harden: I just finished building a device that uses RADAR to toggle power to my speakers when it detects my hand waiving near them! I have some crummy old monitor speakers screwed to a shelf, and although their sound is decent the volume control knob (which […]
Free PCB coupon via Facebook to 2 random commenters
Every Friday we give away some extra PCBs via Facebook. This post was announced on Facebook, and on Monday we’ll send coupon codes to two random commenters. The coupon code usually go to Facebook ‘Other’ Messages Folder . More PCBs via Twitter on Tuesday and the blog every Sunday. Don’t forget there’s free PCBs three […]
Process Automation: Relays and triacs
Andy Brown designed and built this relays and triacs controller board that he could use to automate his homebrewing process: The heaters, fridge and fans that control the temperature in my brew fridge need to be switched on and off and that’s what this board is designed to achieve. As you can see from the diagram […]
Extend Eagle CAD tool with ULPs: Writing your first User language program
Yahya Tawil posted a detailed how-to on writing ULP’s for Eagle CAD: In this tutorial, you will learn how to write your first ULP in Eagle CAD to add a new capability to your CAD tool. User Language Program (ULP) is a set of extensions for Eagle CAD users to either facilitate a routine job […]
YouTube channel IoT view counter
Kenneth Finnegan built this YouTube channel IoT view counter, inspired by Becky Stern’s IoT counter: I’ve wanted an Internet connected read-out for some time now, inspired by the awesome shadow box IoT projects Becky Stern has been doing (weather, YouTube subscribers). I’m certainly not to the same level of packaging as her yet, but I’ve got […]
Dallas Semiconductor DS1284 die decap: A look at a 30 year old design
Dallas Semiconductor DS1284 die decap from Electronupdate: The Dallas Semiconductor DS1284 (and related DS1286 which integrated a battery and crystal in the same package) found lots of use in industrial control and test equipment. 30 years ago processor chips contained not much other than the processor. Utility functions such as real time clocks, non volatile ram […]
#FreePCB via Twitter to 2 random RTs
Every Tuesday we give away two coupons for the free PCB drawer via Twitter. This post was announced on Twitter, and in 24 hours we’ll send coupon codes to two random retweeters. Don’t forget there’s free PCBs three times a every week: Hate Twitter and Facebook? Free PCB Sunday is the classic PCB giveaway. Catch […]
KiCad design files for the LH5801 Sharp Microprocessor
Kai Bader writes, “I’m currently working on a custom development board, based on a quarter of a century old microprocessor, the Sharp LH5801. This microprocessor is the heart of the Sharp PC-1500(A) Pocket Computer, also known as Tandy TRS-80 Model II.” More details at Kai Bader’s blog.
App note: HT45F3630 power tool speed control switch application example
All in one motor control MCU HT45F3630 from Holtek. Link here (PDF) Aimed at the motor speed control product application area, HOLTEK has developed the HT45F3630, which is commonly used in electric drills, electric screwdrivers, lawn mowers and other similar product applications. This MCU provides a group of PWM high voltage and large current output […]
Free PCB coupon via Facebook to 2 random commenters
Every Friday we give away some extra PCBs via Facebook. This post was announced on Facebook, and on Monday we’ll send coupon codes to two random commenters. The coupon code usually go to Facebook ‘Other’ Messages Folder . More PCBs via Twitter on Tuesday and the blog every Sunday. Don’t forget there’s free PCBs three […]
Dual purpose spot welder with pulse duration control
Kerry Wong published a new build: I had wanted to make a spot welder for a while. Most of the DIY spot welders use a momentary switch the primary side of the microwave oven transformer (MOT). Due to the simplicity of this design, it is very simple to make. This design however, has some inherent […]
DIRTY CABLES: What’s in that sample pile?
In the bustling Huaqiangbei market, custom cable manufacturers tout their wares in massive piles that serve as a live catalog of the connectors available within the robust Chinese manufacturing ecosystem. Just like the way the best online casinos display their most popular games front and center, these piles indicate what’s standard and in demand. For […]
Seeed Studio Summer Sale! — Enjoy 10% OFF purchases over $100!
Enjoy 10% OFF your purchase of $100 or more at Seeedstudio Bazaar! Let’s celebrate summer time with a screaming deal on Seeedstudio Bazaar! You can enjoy 10% Discount for order product value above US$100. Promo code: SEEEDSUMMER Promotion Time: From June 13th to June 30th (GMT+8) The coupon will be expired on June 30th. Items: […]
How to: STM32F103C8T6 as an USB device (Virtual serial port / CDC)
In this video Hugatry shared detailed instructions of how to use the STM32F103C8T6 as an USB device with virtual serial port: Cheap STM32F103C8T6 development board Blue STM32F103C8T6 development boards, also known as “BluePill”, are cheap way to get started with 32bit ARM microcontrollers. The STM32 development board can sometimes be bought for less than $2 […]
#FreePCB via Twitter to 2 random RTs
Every Tuesday we give away two coupons for the free PCB drawer via Twitter. This post was announced on Twitter, and in 24 hours we’ll send coupon codes to two random retweeters. Don’t forget there’s free PCBs three times a every week: Hate Twitter and Facebook? Free PCB Sunday is the classic PCB giveaway. Catch […]