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'Celsius' electronics kit
'Celsius' is an electronics kit aimed at young people. Correctly soldering the components onto the included printed circuit board (PCB) creates a badge that measures the temperature, and also keeps track of the minimum and maximum temperatures. As a bonus, the badge lets you play a small memory game.
Er is ook een pagina in het Nederlands aanwezig.
The front and back of a ready built Celsius.
Contact
You can send your questions about the Celsius project to ivo [atsign] digiterraan.nl.
The engineers
Ivo PA1IVO and Leo PA0LEZ.
Thanks to
Building instructions
The building instructions can be found in a colour PDF file. When printing the instructions, use a colour printer in order to see the red lines in the pictures. The instructions are only available in Dutch, but the building instructions will be useful for everyone due to the graphical presentation.
Manual
In the manual you can find all the information you need to know to operate the Celsius, however in Dutch only. It is a PDF file in A4-format, containing two A5 columns of text. By double-side printing the A4 and cutting it exactly into two equal parts, you get two manuals in A5 format.
Temperature correction
According to the specifications the TMP36 temperature sensor can vary up to 2 degrees. If the temperature displayed on the Celsius indeed deviates, this can be corrected on the PCB of the Celsius.
By means of 4 different soldering bridges, the temperature on the display can be shown 3.5 higher or lower at maximum, in steps of 0.5 degrees. If a soldering bridge is present, it is selected. At the start up of the micro controller the state of the soldering bridges are read in.
Examples:
- Soldering bridges "-" and "1", the display will show the temperature 1 degrees lower than the actual measurement of the TMP36 temperature sensor.
- Soldering bridges ".5" en "2", the display will show the temperature 2,5 degrees higher than the actual measurement of the TMP36 temperature sensor.
Schematic
Schematic of the Celsius electrical circuit.
Electronic parts
| Part & reference |
Name / value |
Manufacturer part number |
Supplier & order code |
| 8 Resistors |
470 Ω |
VISHAY MRS25000C4700FCT00 |
Farnell 9468463 |
| Capacitors C1,C2,C3 |
100 nF (pitch 5 mm) |
VISHAY K104K15X7RF53H5 |
Mouser 594-K104K15X7RF53H5 |
| 2 Led displays |
1.3cm Segment display Orange CA |
GNS-5213BUY |
LEDs-buy A3-04-01-OR |
| 6 Switches |
Tactile Switch off-(on) |
ALPS SKHHARA010 |
Farnell 1656425 |
| TMP36 |
Temperature Sensor |
TMP36GT9Z |
TME TMP36GT9Z |
| IC socket |
28 pins (2 x 14) 7.62mm spacing |
ASSMANN WSW AR 28 HZL/7-TT |
RS 674-2498 |
| Microcontroller |
ATmega48PA-PU |
Microchip ATmega48PA-PU |
Reichelt ATMEGA48PA-PU |
| Battery holder |
Battery holder 2 x AAA |
Keystone Electronics 2468 |
Mouser 534-2468 |
| Batteries |
2 x 1,5 Volt AAA |
- |
Your local shop |
Electronic parts Celsius.
PCB layout
The PCB layout is available as:
The PCBs are manufactured at Safe-PCB.
Firmware
The micro controller (ATmega48PA, device signature 0x1E920A) firmware is available as .hex file. The fuse bits settings are: 0xFF, 0xD6, 0x62 (extended, high, low).
Pictures
Celsius at minus four degrees in the snow.
Celsius design prototype.
© 2019-2023 by Ivo Klinkert, PA1IVO -
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