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   <h1 class="title">Project 121</h1>
   <p class="date">2016-07-25</p>
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<p>Project 121 is a rugged temperature logger for high heat environments. It uses the ATtiny4 microcontroller with 32 bytes of ram and 512 bytes of flash storage.</p>
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<img src="photos/thumbnails/boards.png" alt="Version 1 of the boards">
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Version 1 of the boards
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<img src="photos/thumbnails/tinyavr.jpg" alt="ATtiny4-TS8R microcontroller">
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ATtiny4-TS8R microcontroller
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<h2 id="bill-of-materials">Bill of Materials</h2>
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<td>Battery</td>
<td>Tadiran TLH-5903</td>
<td><a href="http://www.tadiran.com/pdf.php?id=TLH-5903" class="uri">http://www.tadiran.com/pdf.php?id=TLH-5903</a></td>
<td>$12.01</td>
<td>-55°C to +125°C</td>
<td>3.0V - 3.6V</td>
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<td>CPU</td>
<td>ATtiny4-TS8R</td>
<td><a href="http://www.atmel.com/images/atmel-8127-avr-8-bit-microcontroller-attiny4-attiny5-attiny9-attiny10_datasheet.pdf" class="uri">http://www.atmel.com/images/atmel-8127-avr-8-bit-microcontroller-attiny4-attiny5-attiny9-attiny10_datasheet.pdf</a></td>
<td>$0.33</td>
<td>-40°C to +125°C</td>
<td>1.8V - 5.5V</td>
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<td>temp0</td>
<td>Silicon Labs Si7051-A20-IM</td>
<td><a href="http://www.silabs.com/Support%20Documents/TechnicalDocs/Si7050-1-3-4-5-A20.pdf" class="uri">http://www.silabs.com/Support%20Documents/TechnicalDocs/Si7050-1-3-4-5-A20.pdf</a></td>
<td>$1.95</td>
<td>-40°C to +125°C</td>
<td>1.9V - 3.6V</td>
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<td>temp1</td>
<td>Silicon Labs Si7051-A20-IM</td>
<td><a href="http://www.silabs.com/Support%20Documents/TechnicalDocs/Si7050-1-3-4-5-A20.pdf" class="uri">http://www.silabs.com/Support%20Documents/TechnicalDocs/Si7050-1-3-4-5-A20.pdf</a></td>
<td>$1.95</td>
<td>-40°C to +125°C</td>
<td>1.9V - 3.6V</td>
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<td>rtc</td>
<td>NXP PCA8565TS</td>
<td><a href="http://www.nxp.com/documents/data_sheet/PCA8565.pdf" class="uri">http://www.nxp.com/documents/data_sheet/PCA8565.pdf</a></td>
<td>$1.73</td>
<td>-40°C to +125°C</td>
<td>1.8V - 5.5V</td>
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<td>analog switch</td>
<td>Diodes 74LVC1G3157</td>
<td><a href="http://www.diodes.com/_files/datasheets/74LVC1G3157.pdf" class="uri">http://www.diodes.com/_files/datasheets/74LVC1G3157.pdf</a></td>
<td>$0.37</td>
<td>-40°C to +125°C</td>
<td>1.65V - 5.5V</td>
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<td>mem0</td>
<td>ST M24M02-DWMN3TP/K</td>
<td><a href="http://www.st.com/web/en/resource/technical/document/datasheet/DM00200595.pdf" class="uri">http://www.st.com/web/en/resource/technical/document/datasheet/DM00200595.pdf</a></td>
<td>$3.25</td>
<td>-40°C to +125°C</td>
<td>2.5V - 5.5V</td>
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<td>mem1</td>
<td>ST M24M02-DWMN3TP/K</td>
<td><a href="http://www.st.com/web/en/resource/technical/document/datasheet/DM00200595.pdf" class="uri">http://www.st.com/web/en/resource/technical/document/datasheet/DM00200595.pdf</a></td>
<td>$3.25</td>
<td>-40°C to +125°C</td>
<td>2.5V - 5.5V</td>
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<td>regulator</td>
<td>TI TPS62230DRYT</td>
<td><a href="http://www.ti.com/lit/ds/symlink/tps62230.pdf" class="uri">http://www.ti.com/lit/ds/symlink/tps62230.pdf</a></td>
<td>$1.69</td>
<td>-40°C to +125°C</td>
<td>2.05V - 6V</td>
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<p>TOTAL $26.53</p>
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