Reads the value of A0 and sets LED1 if A0>2000mV; also dweets data to thingspace.io
Dependencies: NetworkSocketAPI X_NUCLEO_IDW01M1v2 mbed
main.cpp
- Committer:
- tamershek
- Date:
- 2016-11-02
- Revision:
- 0:45e9e04829d0
File content as of revision 0:45e9e04829d0:
// read analog0 and send to thingspace.io // toma 2016-11-01 #include "mbed.h" #include "stdio.h" #include "SpwfInterface.h" #include "TCPSocket.h" #include <string> /************************************* //FRDM-K64: D9->UART1_TX, D7->UART1_RX Pin connections: FRDM IDW01M1 ------ --------- +3v3 <--> +3v3 GND <--> GND D9 <--> D8 D7 <--> D2 SpwfSAInterface spwf(D9, D7, false); *************************************/ /************************************* //LPCXpresso11U68: D9->UART1_TX, D7->UART1_RX Pin connections: LPC IDW01M1 ------ --------- +3v3 <--> +3v3 GND <--> GND A1 <--> D8 A2 <--> D2 SpwfSAInterface spwf(A1, A2, false); *************************************/ //NUCLEO: D8->UART1_TX (PA_9), D2->UART1_RX (PA_10) using namespace std; AnalogIn analog_input_A0(A0); Serial serial_port(USBTX, USBRX); DigitalOut myLed(LED1); SpwfSAInterface spwf(D8, D2, false); int errConnect; int errSend; int main() { float panel_voltage; DigitalOut led(LED1); serial_port.baud(9600); printf("\r\n\r\n*** system restart"); printf("\r\n\r\nanalog0 example using thingspace.io ...\n"); char *ssid = ""; char *seckey = ""; const char *mac; printf("X-NUCLEO-IDW01M1v2 mbed application\r\n"); int spwfResponse; spwfResponse = 0; while(spwfResponse != 1) { printf("connecting to access point ...\r\n"); spwfResponse = spwf.connect(ssid, seckey, NSAPI_SECURITY_WPA2);//WPA printf("\nresponse: %i\n", spwfResponse); if(spwfResponse != 1) { printf("error making connecting to access point\r\n"); } else { printf("success connecting to access point\r\n"); const char *ip = spwf.get_ip_address(); mac = spwf.get_mac_address(); printf("\r\nip address = %s\r\n", (ip) ? ip : "error getting ip address"); printf("mac address = %s\r\n", (mac) ? mac : "error getting the mac address\n"); } } SocketAddress addrDweetServer(&spwf, "thingspace.io"); printf("\r\nthingspace.verizon.com resolved to: %s\r\n\r\n", addrDweetServer.get_ip_address()); TCPSocket socket(&spwf); // connect socket errConnect = socket.connect("thingspace.io", 80); if(errConnect!=0) { printf("\r\ncould not connect to socket; error = %d\r\n", errConnect); } else { printf("socket connected\r\n"); } // get the last 2 bytes of the mac for the thing name std::string macString = mac; macString.erase(0,9); macString.erase(2,1); macString.erase(4,1); const char *macBytes = macString.c_str(); while(1) { panel_voltage = analog_input_A0.read(); printf("voltage: %f\r\n", panel_voltage); // A0 is voltage tolerant to 3.3V, and analog read returns a percentage of the maximum // need to convert the percentage back to a representative number panel_voltage = panel_voltage * 3300; // change the value to be in the 0 to 3300 range // printf("a0 reads %.3f mV\n", panel_voltage); // use 3 decimals of precision // enable LED if voltage exceeds 2000 mV if (panel_voltage > 2000) { myLed = 1; } else { myLed = 0; } // don't bother if never connected ... if (spwfResponse == 1) { // get length of jsonContent as string without streams // adapted from http://codereview.stackexchange.com/questions/51270/socket-http-post-request char dweetBuffer[72] = ""; // create GET HTTP header for dweeting strcpy(dweetBuffer, "GET /dweet/for/nucleo-"); strcat(dweetBuffer, macBytes); char valueRead[20]; sprintf(valueRead, "?voltage=%f", panel_voltage); strcat(dweetBuffer, valueRead); strcat(dweetBuffer, " HTTP/1.1\r\n\r\n"); serial_port.printf("\r\n%s", dweetBuffer); char bufferRx[512] = ""; int countRx = 0; serial_port.printf("sending and receiving data ...\r\n"); errSend = socket.send(dweetBuffer, strlen(dweetBuffer)); countRx = socket.recv(bufferRx, sizeof bufferRx); printf("sent %d bytes\r\nand received %d bytes\r\n\r\n", errSend, countRx); printf(bufferRx); printf("\r\n\r\n*** 5-second pause ...\r\n"); } wait(5.0); // 5000 ms delay before looping to next read } }