---
title: "Project 121"
date: 2016-07-25
vim: nowrap
---

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.


imagethumb:boards.png[Version 1 of the boards]
imagethumb:tinyavr.jpg[ATtiny4-TS8R microcontroller]

## Bill of Materials
--------------|----------------------------|--------------------------------------------------------------------------------------------------------------------|--------|-----------------|------------
Battery       | Tadiran TLH-5903           | <http://www.tadiran.com/pdf.php?id=TLH-5903>                                                                       | $12.01 | -55°C to +125°C | 3.0V - 3.6V
CPU           | ATtiny4-TS8R               | <http://www.atmel.com/images/atmel-8127-avr-8-bit-microcontroller-attiny4-attiny5-attiny9-attiny10_datasheet.pdf>  | $0.33  | -40°C to +125°C | 1.8V - 5.5V
temp0         | Silicon Labs Si7051-A20-IM | <http://www.silabs.com/Support%20Documents/TechnicalDocs/Si7050-1-3-4-5-A20.pdf>                                   | $1.95  | -40°C to +125°C | 1.9V - 3.6V
temp1         | Silicon Labs Si7051-A20-IM | <http://www.silabs.com/Support%20Documents/TechnicalDocs/Si7050-1-3-4-5-A20.pdf>                                   | $1.95  | -40°C to +125°C | 1.9V - 3.6V
rtc           | NXP PCA8565TS              | <http://www.nxp.com/documents/data_sheet/PCA8565.pdf>                                                              | $1.73  | -40°C to +125°C | 1.8V - 5.5V
analog switch | Diodes 74LVC1G3157         | <http://www.diodes.com/_files/datasheets/74LVC1G3157.pdf>                                                          | $0.37  | -40°C to +125°C | 1.65V - 5.5V
mem0          | ST M24M02-DWMN3TP/K        | <http://www.st.com/web/en/resource/technical/document/datasheet/DM00200595.pdf>                                    | $3.25  | -40°C to +125°C | 2.5V - 5.5V
mem1          | ST M24M02-DWMN3TP/K        | <http://www.st.com/web/en/resource/technical/document/datasheet/DM00200595.pdf>                                    | $3.25  | -40°C to +125°C | 2.5V - 5.5V
regulator     | TI TPS62230DRYT            | <http://www.ti.com/lit/ds/symlink/tps62230.pdf>                                                                    | $1.69  | -40°C to +125°C | 2.05V - 6V

TOTAL $26.53

You are viewing proxied material from blog.qartis.com. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.