Logic Voltage Levels
Again and again I need to look up the logic voltage levels of various logic gate standards like HC, HCT, LVT, and so on. I found a nice article on EETimes: A brief recap of popular logic standards. The page… Continue Reading
Again and again I need to look up the logic voltage levels of various logic gate standards like HC, HCT, LVT, and so on. I found a nice article on EETimes: A brief recap of popular logic standards. The page… Continue Reading
Today I tried pairing my UART-to-Bluetooth adapter to a Nexus 7 tablet to see how it works. On the tablet I used BlueTerm, an open-source terminal emulator for communicating with any serial device using a bluetooth serial adapter. I connected… Continue Reading
Mechanical drawing of my EPD ePaper display GDE021A1 is shown below. Signals to the display are connected via a 24-pin flex flat cable. The pitch between pins is only 0.5mm. A suitable matching connector is MOLEX 52435-2471 FPC RCPT 24PIN… Continue Reading
I started a new project called PIP-Watch: Personal Information Panel/Watch. It will be a kind of smartwatch. It will use an ePaper display and a bluetooth connection to a smart-phone. I also registered the project on hackaday.io, to take part… Continue Reading
I got myself an old Philips PM3310 Digital Storage Oscilloscope (DSO). The scope has a classic CRT screen, but otherwise it is a fully digital device. The scope has two channels. Analogue bandwidth of the input attenuator/amplifier is 60MHz, which… Continue Reading
Some five years ago I bought a nice UART-over-Bluetooth adapter module. The module emulates a serial port (UART) over a Bluetooth connection. All necessary chips and an antenna are mounted on a small PCB board depicted below. The type I’ve… Continue Reading
Finally I declare the Talking Clock project complete! Hardware is built and is working, documentation has been written. The permanent project web page is here. I have also created a parallel page on hackaday.io. Enjoy!
Look what I’ve got by post today from our Chinese comrades at ‘Good Display‘ factory: a nice small 2.04-inch electrophoretic display (EPD), or better known as ePaper/eInk display or ‘electronic paper’. Electrophoretic displays (EPD) do not require any power to… Continue Reading
I’ve just assembled both PCB boards of my talking nixie clock together and went ‘whoa, this thing IS really beautiful!’. Check it out below, electronics porn at its best! The first two pictures were taken with a flash to get… Continue Reading
I am working on a talking clock with a remote IR control. The idea is that when I awake at night I don’t have my glasses on, hence I cannot recognize digits on a clock display. So I figured out… Continue Reading