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
Soldering iron driver v1.5 PCBs back in stock
Open Soldering Station PCB is back in stock at Seeed Studio. The completed PCB is the heart of a soldering station, able to control several types of name-brand (and clone) soldering iron pencils. Grab a PCB from Seeed for $7.
Mini 7-segment clock project
Kevin Rye posted his Mini 7-segment clock in the project log forum: I finally got in my OSH Park PCBs for my mini 7-segment clock. It’s using the DP5050 PCB layout. I used the SparkFun 7-seg display, but unfortunately, they screwed up the pinouts on the footprint and pins 10 and 12 are pin-swapped. I […]
Digital light meter using Arduino and BH1750FVI sensor
Raj writes that he’s just finished new project a digital light meter using Arduino and BH1750 sensor. The meter can display light intensity in both Lux and Footcandles: A light meter is a device that measures the intensity of light. It finds applications in schools, hospitals, production areas, passageways and more to measure and maintain […]
UV LED drawing Parallax robot
Gareth over at Parallax forum built this UV LED drawing Parallax robot: I have replaced the pen slot with a bar of downward pointing UltraViolet LEDs one placed central to the hole and the others fanning out….. This arrangement means that i can send the Propellers internal character-set (no costly data tables) to the UV […]
Bus Pirate v4 Acrylic case kit v1 back in stock
The Bus Pirate v4 Acrylic case kit v1 is back in stock at Seeed Studio. This fits the earlier Bus Pirate v4 models which comes in the non-Sick of Beige PCBs. You can get one for $3 at Seeed Studio.
PCB a Week 9: MrRef voltage and current reference update
Mats posted pictures of his MrRef voltage and current reference PCB build. This tool helps check the accuracy of your multimeter: Since my Agilent 34401 is currently out of calibration, I didn’t bother installing the fine-adjustment trimopot. The 6350 is good for 0.02% (1mV) without any adjustments. While developing our new online crypto casino platform, I […]
App note: Calibration of the ATtiny25/45/85 internal temperature reference
Here is an app note from Atmel describing how to calibrate the ATtiny internal temperature reference. This application note describes how to calibrate and compensate the temperature measurements from the ATtiny25/45/85. It can also be used on other AVR microcontrollers with internal temperature sensors. The temperature measurement is based on an on-chip temperature sensor that […]
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: Understanding basic sensored BLDC motor operation
Here’s a video tutorial from Texas Instruments describing basic sensored BLDC motor operation. Michael Firth, Motor Driver marketing manager, discusses the basic operation of a BLDC motor.
App note: Understanding common-mode signals
Here is a tutorial from Maxim on common-mode signals. To understand how common-mode signals are created and then suppressed, you should first understand the interaction of shields and grounds in common cable configurations. The following discussion defines a common-mode signal, reviews the common cable configurations, considers shielded vs. unshielded cables, and describes typical grounding practices. […]
App note: Techniques to disable global interrupts
Here is an app note from Microchip describing ways to disable global interrupts. This application note discusses four methods for disabling global interrupts. All discussion will be specific to the PIC16CXXX family of products, but these concepts are also applicable to the PIC17C42.
Miniscope v2d: STM32 oscilloscope and arbitrary waveform generator
Tomeko has posted an article describing miniscope v2d integrated arbitrary waveform generator: Cheap low-speed dual channel PC/USB oscilloscope and arbitrary waveform generator with STM32F3 microcontroller. Miniscope v2d is based on STM32F303CBT6 microcontroller – LQFP48 device from STM32F3 family featuring: 32 kB RAM on data bus 8 kB RAM on instruction bus 128 kB FLASH memory USB […]
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. More PCBs via Twitter on Tuesday and the blog every Sunday. Don’t forget there’s free PCBs three times every week: Free PCB Sunday. The classic. Every week, get […]
Week in (p)review June 21, 2013
Here’s a summary of major developments over the last week. Free PCB Friday is coming up soon. Check out Kevin’s E-Paper clock project, Bertho’s flipdot, Suf’s universal digital timer based on MSP430 in the project log forum Coming up: Free PCBs via Facebook on Friday App notes on the weekend Free PCB Sunday 3D model on Monday Eagle […]
Tommy Rev0 update
Parker Dillmann of Longhorn Engineer posted an update on his project Rev0 of Tommy we covered previously: The parts for REV 0 of Tommy arrived from Mouser today. Just finished soldering the Propeller portion and it worked first try. I also updated the page for Tommy.
Unicorn Buster, an auto locker for your workstation
Stewartallen has been working on this workstation auto lock project, the Unicorn Buster: What is the Unicorn Buster? It’s an auto locker for your workstation/laptop, keep the key-fob on your person and if you walk away from your machine it’ll lock.
OpenSprinkler, an open-source internet-based sprinkler / irrigation timer
Ray has written a detailed article about his OpenSprinkler 2.0 Arduino-based irrigation controller: OpenSprinkler is an open-source Internet / Ethernet sprinkler timer / controller based on the Arduino platform. It works with standard 24VAC sprinkler valves commonly found in household watering and irrigation systems. You may be planning to buy or have already purchased a commercial […]
DigiX – The ultimate Arduino compatible board with WiFi
Ihsan informs us of Digitstump’s inexpensive, powerful Arduino-compatible board with WiFi – the DigiX: Have you seen this DigiX board by Digistump? They are the ones who created the Digisparks as well. As a difference from Digispark, this time they are aiming high end region of the devboards.
DIY servo tester based on ATTiny85
Trandi made this simple DIY Servo tester based on ATTiny85: I had to test a RC speed controller that I wanted to use to control an electric car window motor, and for the 100th time I was facing the same dilemma: find 8 batteries for my remote control, dismount the RX part from the quadcopter and […]