Javier Perez
Test of DS18B20 Digital temperature sensor using k22f board.
Revision 0:6367a3d990f2, committed 2018-04-19
- Comitter:
- javibenjas
- Date:
- Thu Apr 19 04:10:42 2018 +0000
- Commit message:
- initial version
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/.gitignore Thu Apr 19 04:10:42 2018 +0000 @@ -0,0 +1,4 @@ +.build +.mbed +projectfiles +*.py*
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/DS1820.lib Thu Apr 19 04:10:42 2018 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/Sissors/code/DS1820/#236eb8f8e73a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/README.md Thu Apr 19 04:10:42 2018 +0000 @@ -0,0 +1,57 @@ +# Getting started with Blinky on mbed OS + +This guide reviews the steps required to get Blinky working on an mbed OS platform. + +Please install [mbed CLI](https://github.com/ARMmbed/mbed-cli#installing-mbed-cli). + +## Import the example application + +From the command-line, import the example: + +``` +mbed import mbed-os-example-blinky +cd mbed-os-example-blinky +``` + +### Now compile + +Invoke `mbed compile`, and specify the name of your platform and your favorite toolchain (`GCC_ARM`, `ARM`, `IAR`). For example, for the ARM Compiler 5: + +``` +mbed compile -m K64F -t ARM +``` + +Your PC may take a few minutes to compile your code. At the end, you see the following result: + +``` +[snip] ++----------------------------+-------+-------+------+ +| Module | .text | .data | .bss | ++----------------------------+-------+-------+------+ +| Misc | 13939 | 24 | 1372 | +| core/hal | 16993 | 96 | 296 | +| core/rtos | 7384 | 92 | 4204 | +| features/FEATURE_IPV4 | 80 | 0 | 176 | +| frameworks/greentea-client | 1830 | 60 | 44 | +| frameworks/utest | 2392 | 512 | 292 | +| Subtotals | 42618 | 784 | 6384 | ++----------------------------+-------+-------+------+ +Allocated Heap: unknown +Allocated Stack: unknown +Total Static RAM memory (data + bss): 7168 bytes +Total RAM memory (data + bss + heap + stack): 7168 bytes +Total Flash memory (text + data + misc): 43402 bytes +Image: .\.build\K64F\ARM\mbed-os-example-blinky.bin +``` + +### Program your board + +1. Connect your mbed device to the computer over USB. +1. Copy the binary file to the mbed device. +1. Press the reset button to start the program. + +The LED on your platform turns on and off. + +## Troubleshooting + +If you have problems, you can review the [documentation](https://os.mbed.com/docs/latest/tutorials/debugging.html) for suggestions on what could be wrong and how to fix it.
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Thu Apr 19 04:10:42 2018 +0000
@@ -0,0 +1,62 @@
+#include "mbed.h"
+#include "DS1820.h"
+
+#define SLEEP_S 2
+
+// I'm using DS18B20, connections
+// red -> 5v
+// blue -> GND
+// yellow -> D6
+DigitalOut led_r(LED1);
+DigitalOut led_g(LED2);
+DigitalOut led_b(LED3);
+DS1820 temp_probe(D6);
+
+//we will use the first read as environment temperature
+float env_temperature = -99;
+// red means higher than environment
+// blue means cooler than environment
+// green means same as env
+
+float read_temperature() {
+ float tmp_temp;
+ temp_probe.convertTemperature(true, DS1820::this_device);
+ do {
+ // TODO limit the n of tries
+ // if device is not responding, will cycle forever
+ tmp_temp = temp_probe.temperature();
+ wait_ms(10);
+ } while(tmp_temp == -1000);
+ return tmp_temp;
+}
+
+int main() {
+ printf("Temperature probe test\r\n");
+ float temperature = 0;
+ temp_probe.setResolution(9); //9bits
+
+ //read env temperature
+ wait(1); //wait for device to be ready
+ env_temperature = read_temperature();
+
+ while(1) {
+ temperature = read_temperature();
+ printf("Temperature %3.1foC\r\n", temperature);
+ if(temperature < env_temperature) {
+ led_r = 1; // 1 is off in this board
+ led_g = 1;
+ led_b = 0;
+ } else if(temperature > env_temperature) {
+ led_r = 0;
+ led_g = 1;
+ led_b = 1;
+ } else {
+ led_r = 1;
+ led_g = 0;
+ led_b = 1;
+ }
+ // sleep
+ wait(SLEEP_S);
+ }
+}
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-os.lib Thu Apr 19 04:10:42 2018 +0000 @@ -0,0 +1,1 @@ +https://github.com/ARMmbed/mbed-os/#addec7ba10054be03849eff58a1d17f157391e7d