Lluis Nadal
Wireless temperature transmitter with ER400TRS transceiver and MCP9700 temperature sensor.
main.cpp@0:407b38152be7, 2011-08-31 (annotated)
- Committer:
- lnadal
- Date:
- Wed Aug 31 04:08:11 2011 +0000
- Revision:
- 0:407b38152be7
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| lnadal | 0:407b38152be7 | 1 | |
| lnadal | 0:407b38152be7 | 2 | /* |
| lnadal | 0:407b38152be7 | 3 | **************************************************************************************************** |
| lnadal | 0:407b38152be7 | 4 | Wireless temperature transmitter with ER400TRS wireless transceiver and MCP9700 temperature sensor. |
| lnadal | 0:407b38152be7 | 5 | 433 MHz transceiver. 180 bytes of data. 19200 Baud. |
| lnadal | 0:407b38152be7 | 6 | MCP9700 temperature sensor: -40ºC - +125ºC. |
| lnadal | 0:407b38152be7 | 7 | |
| lnadal | 0:407b38152be7 | 8 | Wiring MCP9700: |
| lnadal | 0:407b38152be7 | 9 | p1: +3V3. p2(Vout): mBed's p15. p3: ground. |
| lnadal | 0:407b38152be7 | 10 | |
| lnadal | 0:407b38152be7 | 11 | Wiring ER400TRS: |
| lnadal | 0:407b38152be7 | 12 | p1: antenna(17 cm). p2,p7(Host Ready Input) and p9: ground. |
| lnadal | 0:407b38152be7 | 13 | p6(Serial Data In): mBed's p9(tx). p8: Vcc = +5 V. |
| lnadal | 0:407b38152be7 | 14 | |
| lnadal | 0:407b38152be7 | 15 | Author: Lluis Nadal. August 2011. |
| lnadal | 0:407b38152be7 | 16 | ***************************************************************************************************** |
| lnadal | 0:407b38152be7 | 17 | */ |
| lnadal | 0:407b38152be7 | 18 | |
| lnadal | 0:407b38152be7 | 19 | #include "mbed.h" |
| lnadal | 0:407b38152be7 | 20 | //#include "TextLCD.h" . Optional |
| lnadal | 0:407b38152be7 | 21 | |
| lnadal | 0:407b38152be7 | 22 | // LCD optional |
| lnadal | 0:407b38152be7 | 23 | // Define LCD connections. |
| lnadal | 0:407b38152be7 | 24 | //TextLCD lcd(p24, p26, p27, p28, p29, p30); // rs, e, d4, d5, d6, d7 |
| lnadal | 0:407b38152be7 | 25 | |
| lnadal | 0:407b38152be7 | 26 | Serial pc(USBTX, USBRX); // tx, rx |
| lnadal | 0:407b38152be7 | 27 | Serial transmitter(p9, p10); // tx, rx |
| lnadal | 0:407b38152be7 | 28 | AnalogIn temp(p15); |
| lnadal | 0:407b38152be7 | 29 | |
| lnadal | 0:407b38152be7 | 30 | char s1[10]; |
| lnadal | 0:407b38152be7 | 31 | char s2[10]; |
| lnadal | 0:407b38152be7 | 32 | float T; |
| lnadal | 0:407b38152be7 | 33 | |
| lnadal | 0:407b38152be7 | 34 | |
| lnadal | 0:407b38152be7 | 35 | float tempRead() { |
| lnadal | 0:407b38152be7 | 36 | |
| lnadal | 0:407b38152be7 | 37 | float Ta = 0.0; |
| lnadal | 0:407b38152be7 | 38 | float t = temp.read(); // read the analog data |
| lnadal | 0:407b38152be7 | 39 | Ta = ((t * 3.3) - 0.5)/ 0.01; |
| lnadal | 0:407b38152be7 | 40 | |
| lnadal | 0:407b38152be7 | 41 | return Ta; // return the temp |
| lnadal | 0:407b38152be7 | 42 | } |
| lnadal | 0:407b38152be7 | 43 | |
| lnadal | 0:407b38152be7 | 44 | |
| lnadal | 0:407b38152be7 | 45 | int main() { |
| lnadal | 0:407b38152be7 | 46 | |
| lnadal | 0:407b38152be7 | 47 | //lcd.cls(); |
| lnadal | 0:407b38152be7 | 48 | pc.printf("Init: 19200 Baud\r\n\r\n"); |
| lnadal | 0:407b38152be7 | 49 | //lcd.printf("Init: 19200 Baud"); |
| lnadal | 0:407b38152be7 | 50 | wait(2); |
| lnadal | 0:407b38152be7 | 51 | transmitter.baud(19200); |
| lnadal | 0:407b38152be7 | 52 | |
| lnadal | 0:407b38152be7 | 53 | while (1) { |
| lnadal | 0:407b38152be7 | 54 | T = tempRead(); |
| lnadal | 0:407b38152be7 | 55 | sprintf(s1, "%.1f", T); |
| lnadal | 0:407b38152be7 | 56 | sprintf(s2, "%.1f\n", T); //scanf in the receiver needs a whitespace or newline character |
| lnadal | 0:407b38152be7 | 57 | transmitter.printf(s2); |
| lnadal | 0:407b38152be7 | 58 | //lcd.cls(); |
| lnadal | 0:407b38152be7 | 59 | sprintf(s1,"%s C", s1); |
| lnadal | 0:407b38152be7 | 60 | pc.printf(" %s\r\n", s1); |
| lnadal | 0:407b38152be7 | 61 | //lcd.printf(s1); |
| lnadal | 0:407b38152be7 | 62 | |
| lnadal | 0:407b38152be7 | 63 | wait(2); |
| lnadal | 0:407b38152be7 | 64 | } |
| lnadal | 0:407b38152be7 | 65 | } |