Mercurial > ~darius > hgwebdir.cgi > iec1107
comparison hw/README @ 7:8031548a5d48
Add some hardware notes.
| author | Daniel O'Connor <darius@dons.net.au> |
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| date | Wed, 20 Nov 2013 23:26:45 +1030 |
| parents | |
| children | b4de1b6f8f78 |
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| 6:e9efe3ddc9a7 | 7:8031548a5d48 |
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| 1 The schematic is designed using TinyCAD | |
| 2 http://sourceforge.net/projects/tinycad/ | |
| 3 | |
| 4 The stripboard was laid out using VeeCAD | |
| 5 http://veecad.com/ | |
| 6 | |
| 7 It is loosly based on an Elektor circuit | |
| 8 http://www.elektor.com/magazines/2002/march/iec1107-electricity-meter-interface.55617.lynkx | |
| 9 | |
| 10 The photodiode is an OSRAM BP104, the IR LED a generic IR LED from Jaycar | |
| 11 (ZD1947) with a spectral peak of 940nm. The opamp is an LM348 clone (ZL3348 from Jaycar). | |
| 12 | |
| 13 The 6 pin interface is a TinyOS FTDI breakout | |
| 14 http://www.tinyosshop.com/index.php?route=product/product&product_id=186 | |
| 15 | |
| 16 Mine is running at 5V but it works at 3.3V. | |
| 17 | |
| 18 I needed to use the FTDI EEPROM tool to invert the TX & RX sense using FT_Prog from | |
| 19 http://www.ftdichip.com/Support/Utilities.htm | |
| 20 | |
| 21 The need to invert could be rectified by modifying the circuit, but modifying the | |
| 22 EEPROM was a lot easier than changing the circuit. | |
| 23 |