Peter Scargill has written an article ‘the world of MQTT on ESP8266: The obvious choice was a local copy of MOSQUITTO – the free package designed, apparently by Roger Light. A simple DOS application which can also act as a service. Marvellous. Now I needed to put the code into the ESP8266 – that worked – […]
Author Archives: DP
iButtonLink T-Sense 1-wire sensor (Maxim DS18B20) + PIC 18F14K22
Chas over at PNW/Electronics writes: I came across a stash of iButton T-sense 1-wire sensors.. so I grabbed a couple and decided to check out 1-wire. Maxim makes a 1-wire device called the DS18B20. It’s a 9-12 bit temperature sensor with the possibility of being powered by parasitic power from the data line. This cuts […]
#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 […]
CO2 meter and Xively logger with NDIR infrared sensor built on AVR ATmega328
Davide Gironi published a new build an AVR ATmega328 based CO2, temperature and humidity logger and meter: It logs data feed, CO2 in air in terms of ppm, temperature and humidity to a xively.com feed. It also display realtime data to user through a 16×2 characters LCD. This logger it is based on the xively logger […]
Reverse engineering a Beseler PM2L Color Analyzer
Kerry Wong wrote an article on reverse engineering a Beseler PM2L Color Analyzer: I recently acquired an old Beseler PM2L color analyzer. This kind of color analyzer was designed to analyze the color or exposure of film negatives at a certain location by comparing the intensity of the filtered light of each color channel (CMY and white). […]
Location based development board
Matt Coates of Sky Labs Electronics writes: So here it is! Courtesy of Dangerous Prototypes Dirty PCB service, I have been able to put together and complete the testing of the first prototype of my very own location based development board. So lets talk about what you’re looking at. The board is a 4 layer PCB of dimensions […]
A PIC based SHF audio / video workstation
Tekman has shared his 1.2 GHz band SHF workstation in the forum: This is a SHF workstation that I built to work the satellite frequencies. Centered around 1.2 GHz, I used this workstation in conjunction with my dish driver software to map the sky for various Free to air and AV sats. The various band LNB’s […]
Creating Android BLE app
Dany over at Elecfreaks writes: If you are an electronics enthusiast, and also fond of programming, I would be very glad to share with you an Android BLE application development method, so you can integrate the phone and MCU to do some more interesting things. Right now we begin to explain how to develop an […]
App note: Implementing the suspend indicator using microchip USB hubs
App note(PDF!) on Microchips’ USB hubs suspend indicator feature. The USB251xB / USB3x03 / USB253x / USB3x13 / USB46x6 product lines are a family of feature-rich, low power USB 2.0 hubs optimized for use in embedded systems where high performance and advanced functionality are critical design requirements. The USB251xB / USB3x03 / USB253x / USB3x13 […]
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 device design checklist
Application note(PDF) on the design of various USB controllers from Microchip. The purpose of this application note is to provide a list of items that need to be considered when designing systems that incorporate the following categories of Microchip USB products: -USB 2.0 Hubs -USB 3.0 Hubs -Flash Media Controllers -Flash Media Controller Hub Combo […]
App note: Using a hardware or software CRC with enhanced core PIC16F1XXX in class B applications
An app note from Microchip: Using a hardware or software CRC with enhanced core PIC16F1XXX in class B applications (PDF!) Class B safety routines are increasingly used in microcontrollers to detect faults in safety-critical applications. The primary method for detecting faults in microcontroller program memory is by using a Cyclic Redundancy Check (CRC) as defined by the […]
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 times every […]
Wavetek 1045 RF power meter teardown
Kerry Wong did a teardown of a Wavetek 1045 RF power meter: I bought a Wavetek 1045 RF power meter off eBay a few weeks ago. It came with a 13787 detector which is capable of measuring RF power between -50 dBm to 10 dBm with a frequency range of 1 MHz to 18 GHz. […]
Happy New Year 2015 from Dangerous Prototypes
Happy New Year! Thank you for reading the blog and being part of our community in 2014! We’re looking forward to more open hardware projects, more how-tos, more videos, more free PCBs, and more hacking in 2015.
Nixie Tube Thing – Dirty PCB to the rescue!
Crawford writes: I have been lusting over the Nixie Tube Driver that Ian brought to the 2012 World Maker Faire. When I met him there I asked about board production, but he explained it was a one-time thing. Fair enough. Well it’s 2014 now and DirtyPCB exists. I grabbed the design off the forum, and […]
#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 […]
WiFi IoT 3 channel relay board with MQTT and HTTP API using ESP8266
Martin writes: The ESP8266 DHT22/LED blinker project grew into a M2M relay board project with the following features in mind: Relatively small (10x5cm) PCB Powered via on-board power supply or externally via a micro-USB plug Has three 2A Sharp Solid State Relays (later version has 8A SSR) DHT22 humidity/temperature and/or DS18b20 temperature sensor support to use […]
Numato Mega New Year give away 2015 – Grab your surprise gift
Numato is hosting a ‘Mega New Year give away 2015‘. Two random lucky winners will receive Waxwing Spartan 6 FPGA Development Board. Another five lucky winners will receive Mimas V2 Spartan 6 FPGA Development Board. And ten lucky winners will receive PIC18 Microcontroller Development Board. Visit the contest info page for details. Again that time […]
TinkerRule- The Maker’s Swiss Army knife
Rohit writes, “I made a PCB Ruler that contains almost all tools to help you from designing a part to testing the final build” More details on Rohit’s blog. Via the contact form.