Bluetooth Power Modes
In previous post we discussed CPU power consumption in PIP-Watch. Today we look into Bluetooth power consumption because it is significant as much as the CPU power.
In previous post we discussed CPU power consumption in PIP-Watch. Today we look into Bluetooth power consumption because it is significant as much as the CPU power.
Processor Power The PIP-Watch is a battery-powered device that will be continuously on, hence the average power consumption is one of the most important engineering aspects. In this post I will go through two simple steps of optimizing CPU power… Continue Reading
The printed circuit boards for PIP-Watch Zero came from Pragoboard fab on Friday 12 Sept. I ordered three pieces because the cost is practically identical as for two or one. On Saturday I assembled one board, and on Sunday I… Continue Reading
Schematic [PDF], BOM, and PCB layout for my PIP-Watch “Zero” was completed during this week. Layout data was sent to a local PCB fab – pragoboard.cz. The board should be ready and shipped during the next week. The PCB is… Continue Reading
In my previous homebrew projects I did not use any operating system in the embedded processors. Software was programmed on a bare-metal hardware. In my Talking Clock project I created a simple cooperative event-processing abstraction layer, but it was very… Continue Reading
GDE021A1 is a graphics display with a resolution 172×72 pixels, each pixel is 2 bits deep (4 shades of grey). The display has an internal controller SSD1606 with a framebuffer. The framebuffer size is 172*72*2/8=3096 Bytes. When the display is… Continue Reading
Today I have managed to get the GDE021A1 ePaper display (EPD) working! I used my minimal EPD-Driver board, which implements a flat-flex cable connector and a booster circuit for the display. The booster generates high voltages needed for display operation… Continue Reading
In my PIP-Watch project I will use a Li-On battery to provide power. Li-On batteries are easy to use in hobby projects: they are light, small, with high capacity, and they come in variety of sizes. Most (not all) Li-On… Continue Reading
Target hardware: VOLTCRAFT VC-870 Multimeter UNI-T UT-D04 USB Cable Software repository location: https://github.com/jsyk/VC870_USB_Datalog The issue this software solves: Although the Voltcraft multimeter and the UNI-T USB cable areĀ hardware compatible (the USB cable adapter fits into the multimeter connector perfectly),… Continue Reading
Being mostly ‘digital’ guy, I’ve always shied off from switching mode power supplies because they are too much analog to my liking. I decided to break my habit by playing around with MC34063A, a 1.5-A Boost/Buck/Inverting Switching Regulator. I tried… Continue Reading