Author Archives: DP

Seeed Studio Summer Sale! — Enjoy 10% OFF purchases over $100!

via Dangerous Prototypes

summer22

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:
All Bazaar items! (Bundle sales items are excluded.)

Visit Seeed Studio’s promo page for details.

How to: STM32F103C8T6 as an USB device (Virtual serial port / CDC)

via Dangerous Prototypes

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 and ST-LinkV2 compatible programmer and debugger doesn’t cost much more than that either.
The STM32F103C8T6 has nice amount of flash and RAM, runs at 72MHz and best of all: It has built-in USB. It is possible to program these STM32 boards to act as an USB devices, without “FTDI chip”. In this post and in the embedded video I will teach step by step how to use the STM32F103C8T6 as an USB device, in particular a virtual serial port.

More details at Hugatry’s HackVlog.

#FreePCB via Twitter to 2 random RTs

via Dangerous Prototypes

BP

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 it every Sunday, right here on the blog
  • Tweet-a-PCB Tuesday. Follow us and get boards in 144 characters or less
  • Facebook PCB Friday. Free PCBs will be your friend for the weekend

Some stuff:

  • Yes, we’ll mail it anywhere in the world!
  • Check out how we mail PCBs worldwide video.
  • We’ll contact you via Twitter with a coupon code for the PCB drawer.
  • Limit one PCB per address per month please.
  • Like everything else on this site, PCBs are offered without warranty.

We try to stagger free PCB posts so every time zone has a chance to participate, but the best way to see it first is to subscribe to the RSS feed, follow us on Twitter, or like us on Facebook.

Arduino data logger update

via Dangerous Prototypes

s-teriminalminiloggerthecavepearlproject-600

An update on Edward Mallon’s Arduino data logger project we covered previously:

If you need a logger with a cheap durable housing, it’s still hard to beat the Dupont-jumper build released in 2016. But sometimes I need more of a bare-bones unit for bookshelf test runs while I shake down a new sensor. I can whip up a breadboard combo in about twenty minutes, but they can stop working if I bump one of the wires by accident. I’ve lost SD cards from this half way through a long term test, and I’ve also run into issues with noise & resistance from those tiny breadboard contact points.
To address this problem I’ve come up with a new configuration that uses a screw-terminal expansion shield originally intended for the Arduino Nano. This requires a modest bit of soldering, and after some practice, between 1-1.5 hours to finish depending on how many “extras” you embed.

Read more details at his blog here.

Free PCB Sunday: Pick your PCB

via Dangerous Prototypes

BP-600x373

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 get a coupon code for the free PCB drawer tomorrow morning. Pick your own PCB. You get unlimited free PCBs now – finish one and we’ll send you another! Don’t forget there’s free PCBs three times every week:

Some stuff:

  • Yes, we’ll mail it anywhere in the world!
  • Be sure to use a real e-mail in the address field so we can contact you with the coupon.
  • Limit one PCB per address per month please.
  • Like everything else on this site, PCBs are offered without warranty.
  • PCBs are scrap and have no value, due to limited supply it is not possible to replace a board lost in the post

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App note: How to measure thermal resistance of LED emitters and LED arrays

via Dangerous Prototypes

an_lumileds_wp23

Another white paper from Lumileds about LED thermal resistance. Link here (PDF)

Thermal performance is the most critical factor of a well-designed LED lighting system. A lighting system with proper thermal design has higher efficacy, meaning more light can be extracted using less energy, and better long term reliability.