We recently visited a silicone compression molding factory with our friends at Dangerous Prototypes. This is the same technology used for making our silicone keypads for the T400 temperature datalogger. I put together a short video showing the overall process. The process begins by mixing a base material with colorant using a roller machine similar to a [...]
One of the greatest features of the opensource hardware community is the abundance of resources we can use in designing new hardware. In the T400 temperature datalogger we extensively used parts from other opensource companies. We also made several Eagle parts of our own too, including those for our custom thermocouple connector and 132x64 LCD. We've [...]
Learn all about diodes, their types, and applications. In semiconductor and electronics industry, a diode is a widely used discrete component. It is a significant element in many electronic circuits and applications ranging from low power signal circuits to power rectification. Based on the functions and ratings, there are different types of diodes. However, all [...]
Most old mobile phones come to Shenzhen to be refurbished and resold or disassembled for parts and recycled. This is where all those cheap Nokia 3310/5110 LCD shields come from, which is great, but most of the interesting and useful parts are wasted. There is a fantastic opportunity to save a heap of phones from the recycling bin and save people a pocket full of money. We can make a positive impact if we reuse some of these phones, that we are literally tripping over, as GSM bridges to the internet of things (IoT).
I spoke with Daniel Dern over at IEEE Spectrum about why we decided to crowdfund the T400 temperature datalogger. Daniel's article is spot on with the most important reasons a hardware project should use crowdfunding: you know if people want it, you know how many to make, and you have the money to do it. Crowdfunding—collecting money from a [...]
Electronics-Lab.com shares a hot tip on protecting USB circuits during manufacturing tests and it can be used in other measurement and automation applications. Applications notes like this have been indispensable in designing the T400 temperature datalogger, for which we used TVS diodes and a thermal fuse. USB data-acquisition modules offer good value and ease of use, [...]
A few days ago the Pax Instruments team arrived in Shenzhen to manufacture the T400. There are many challenges ahead and we look forward to handling each one successfully. One of the more frustrating challenges is circumventing the internet censorship the government inflicts on the people who live here. Without censorship circumvention the internet can [...]