Texas Instruments, Beagle's heart factory, has launched a cheap module that provides wifi connectivity to your garage project. This post is about how communicate a tiny mini Teensy with a CC3000 breakout from Adafruit.
Wiring
Pins mapping
Teensy pin CC3000 pin Color GND GND Black Vin Vin Red 13 CLK Blue 12 MISO Orange 11 MOSI Yellow 10 CS Green 4 VBEN Ochre 3 IRQ Purple
Teensy stuff
I will conveniently assume that you already have Teensyduino (Arduino 1.0.5 + Teensy add-on), if not, please take a look to this page.
Library
Click here and download the lastest Adafruit's CC3000 Library for Arduino IDE. Unzip the file and rename the just created directory to "Adafruit_CC3000". Go to Arduino IDE and import the library.
(My Arduino IDE is almost in spanish :P)
Power
You can supply power via USB (my choice for debugging) or Vin.
Testing
For testing purposes I wrote a program that sends a heartbeat every 2 seconds. Check this code out.
#include <Adafruit_CC3000.h>
#include <ccspi.h>
#include <SPI.h>
#include <string.h>
#include <stdlib.h>
#include "utility/debug.h"
#define ADAFRUIT_CC3000_IRQ 3
#define ADAFRUIT_CC3000_VBAT 4
#define ADAFRUIT_CC3000_CS 10
Adafruit_CC3000 cc3000 = Adafruit_CC3000(ADAFRUIT_CC3000_CS, ADAFRUIT_CC3000_IRQ, ADAFRUIT_CC3000_VBAT,
SPI_CLOCK_DIV2);
// YOU MUST EDIT THIS
#define WLAN_SSID "YOUR_AP_NAME"
#define WLAN_PASS "YOU_AP_PASS"///
// Security can be WLAN_SEC_UNSEC, WLAN_SEC_WEP, WLAN_SEC_WPA or WLAN_SEC_WPA2
#define WLAN_SECURITY WLAN_SEC_WPA2
// Server configuration example, YOU MUST EDIT THISconst uint8_t SERVER_IP[4] = { 192, 168, 0, xx };
const uint16_t SERVER_PORT = 3000;
///
#define HEARTBEAT_INTERVAL 2000
static Adafruit_CC3000_Client client;
static uint32_t last_heartbeat_time;
static uint8_t connect_retry_count = 0;
void connect_to_server(void)
{
if(connect_retry_count > 0) {
Serial.println(F("CC3000> Waiting 2 seconds before retrying to connect..."));
delay(2000);
}
Serial.println(F("CC3000> Connecting to server..."));
client = cc3000.connectTCP(cc3000.IP2U32(SERVER_IP[0], SERVER_IP[1], SERVER_IP[2], SERVER_IP[3]),
SERVER_PORT);
if (!client.connected()) {
Serial.println(F("CC3000> Can't connect to server"));
connect_retry_count++;
return;
}
connect_retry_count = 0;
Serial.println(F("CC3000> Connected!"));
last_heartbeat_time = millis();
}
// Set up the HW and the CC3000 module (called automatically on startup)void setup(void)
{
Serial.begin(115200);
delay(1000); // Without this delay Serial Monitor does not work
/* Initialise the module */Serial.println(F("\nCC3000> Initializing..."));
if (!cc3000.begin())
{
Serial.println(F("CC3000> Couldn't begin()! Check your wiring?"));
while(1);
}
if (!cc3000.connectToAP(WLAN_SSID, WLAN_PASS, WLAN_SECURITY)) {
Serial.println(F("CC3000> Failed!"));
while(1);
}
Serial.println(F("CC3000> Connected to AP"));
/* Wait for DHCP to complete */Serial.println(F("Request DHCP"));
while (!cc3000.checkDHCP())
{
delay(100); // ToDo: Insert a DHCP timeout!
}
/* Display the IP address DNS, Gateway, etc. */
while (! displayConnectionDetails()) {
delay(1000);
}
}
void loop(void)
{
if(!client.connected()) {
connect_to_server();
} else {
if(millis() - last_heartbeat_time >= HEARTBEAT_INTERVAL) {
client.fastrprintln("Hi, I'm a Teensy");
last_heartbeat_time = millis();
}
}
}
// Tries to read the IP address and other connection details
bool displayConnectionDetails(void)
{
uint32_t ipAddress, netmask, gateway, dhcpserv, dnsserv;
if(!cc3000.getIPAddress(&ipAddress, &netmask, &gateway, &dhcpserv, &dnsserv))
{
Serial.println(F("Unable to retrieve the IP Address!\r\n"));
return false;
}
else
{
Serial.print(F("\nIP Addr: ")); cc3000.printIPdotsRev(ipAddress);
Serial.print(F("\nNetmask: ")); cc3000.printIPdotsRev(netmask);
Serial.print(F("\nGateway: ")); cc3000.printIPdotsRev(gateway);
Serial.print(F("\nDHCPsrv: ")); cc3000.printIPdotsRev(dhcpserv);
Serial.print(F("\nDNSserv: ")); cc3000.printIPdotsRev(dnsserv);
Serial.println();
return true;
}
}
Applications
I'm using these devices to build a swarm robot for a robotic contest in Chile. You can see a proof-of-concept in this video: