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  • About the Author
  • Projects
    • 2019 DIY Vacuum Tube Watch EVERGLOW V2.1
    • 2019 DIY Analog Curve Tracer
    • 2014 DIY PIP-Watch
    • 2010 DIY Talking Clock
    • 2013 SMECY (at UTIA)
    • 2012 ADVANCE (at HWU)
    • 2011 Apple-CORE (at UTIA)
  • Blog Posts

PIP-Watch

9

Error: jtag status contains invalid mode value – communication failure = SOLVED!

Posted on October 22, 2014 by Jarda

This issue bugged me a long time, finally I solved it this evening. Debugging code on my PIP-Watch using my ST-LINK-v2 JTAG debugger was very painful because the debugger software — OpenOCD and GDB — kept failing randomly during debug… Continue Reading →

PIP-Watch
2

Bluetooth Power Modes

Posted on September 29, 2014 by Jarda

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.

Hackaday_2014, PIP-Watch
0

Processor Low-power Optimizations in PIP-Watch

Posted on September 28, 2014 by Jarda

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 →

Hackaday_2014, PIP-Watch
0

PIP-Watch Boards & Assembly

Posted on September 17, 2014 by Jarda

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 →

Hackaday_2014, PIP-Watch
0

PIP-Watch “Zero” – Schematic, BOM, and Layout

Posted on September 7, 2014 by Jarda

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 →

Hackaday_2014, PIP-Watch
0

FreeRTOS tasks and queues

Posted on July 27, 2014 by Jarda

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 →

Hackaday_2014, PIP-Watch
3

Framebuffer Drawing with u8glib [VIDEO]

Posted on July 2, 2014 by Jarda

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 →

Displays, Hackaday_2014, PIP-Watch, Video
3

EPD Display Working!

Posted on June 18, 2014 by Jarda

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 →

Hackaday_2014, PIP-Watch, Video
6

Li-On Battery Charging (and Discharging)

Posted on June 11, 2014 by Jarda

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 →

Hackaday_2014, PIP-Watch
0

Bluetoothing to Android Tablet

Posted on May 18, 2014 by Jarda

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 →

Hackaday_2014, PIP-Watch

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