RGB WiFi Lamp

Firmware

This is the official firmware repository for the BinarySpace RGB WiFi Lamp project. This firmware is still in alpha stage, and subject to change.

Planned changes include:

Configure the WiFi Lamp to connect onto your SSID
Variety of operating modes like
- Fixed colour operation
- Rainbow gradient
- Time-based colour changing
- API-based colour changing

Connecting to the WiFi lamp

To connect to the WiFi lamp web server, scan for an open WiFi network using your cellphone, tablet or laptop that begins with the letters ESP_xxxxxx. This is the automatically created SSID of the ESP8266 WiFi module used in the lamp. Your WiFi client needs to be configured to use DHCP.

Once connected, simply point your browser at http://192.168.4.1 and you should see the rudementary web interface allowing you to switch the WiFi lamp on in the red colour or off.

A second option is to enter the following URL
http://192.168.4.1/setcolor?r=x&g=x&b=x
where x is a number between 0 and 255 for the intensity of (r)ed, (g)reen and (b)lue respectively. Any of the r,g,b parts not specified will automatically default to 0

Supported Platforms

ST Nucleo F103RB
ST Nucleo F302R8
ST Nucleo L152RE
ST Nucleo F401RE

Unsupported Platforms

ST Nucleo F030R8 (unsupported due to insufficient registers for PololuLed library)

How to update your firmware

One of the best things about the ST Nucleo series is that they enumerate as a USB Mass Storage device when plugged in. Updating the firmware is as simple as compiling it using mbed compiler(free registration required to use) for your selected platform, plugging in your Nucleo and copying the .bin file created by the compiler to the USB drive enumerated by the Nucleo. That's it!

Code is fully Open Source

Please feel free to fork this repository and to submit pull requests if you make any cool additions/changes.

If you are developing changes to the firmware and monitoring via serial console for debugging purposes, note than you can simply comment out the #define DEBUG_WIFI line at the top of the main.cpp file to make the output much less verbose. This effectively disables debugging of the WebServer library code and echoing of communications between the Nucleo and the ESP. It also makes the web server noticeably faster, as it doesn't have to output a lot of serial data before handling requests.

LED Strip colour inconsistency

If you are experiencing problems with the LED's not all changing colour, or perhaps flickering or incorrect colour, there could be 2 potential problems we have identified.

Power Supply problems - If the power supply is not providing enough power, or not clean enough power, you may experience flickering or random colour changes. Ensure that your power supply can provide enough power (1A @ 5V recommended). If this does not solve your problem, soldering a capacitor over the power supply lines(5V, GND) may help to clean out any noise from the power supply. (100uF minimum)
Depending on cable lengths and connectors, noise on the data line may also be a problem. Try soldering a 100Ω - 500Ω resistor in line on the Din pin of the LED strip

Firmware update for the ESP8266 Module

We suggest you upgrade the firmware on the ESP8266 module to the latest official AT firmware from Espressif. Click Here for a detailed upgrade quide.

PololuLedStrip/PololuLedStrip.h@1:f07afcffeb5a, 2014-11-20 (annotated)

Committer:: sschocke
Date:: Thu Nov 20 17:44:22 2014 +0000
Revision:: 1:f07afcffeb5a
Child:: 2:48412ab84b71

Extracting URI and Pololu LED Intergation

Who changed what in which revision?

User	Revision	Line number	New contents of line
sschocke	1:f07afcffeb5a	1	#include "mbed.h"
sschocke	1:f07afcffeb5a	2
sschocke	1:f07afcffeb5a	3	#ifndef _POLOLU_LED_STRIP_H
sschocke	1:f07afcffeb5a	4	#define _POLOLU_LED_STRIP_H
sschocke	1:f07afcffeb5a	5
sschocke	1:f07afcffeb5a	6	namespace Pololu
sschocke	1:f07afcffeb5a	7	{
sschocke	1:f07afcffeb5a	8	#ifndef _POLOLU_RGB_COLOR
sschocke	1:f07afcffeb5a	9	#define _POLOLU_RGB_COLOR
sschocke	1:f07afcffeb5a	10
sschocke	1:f07afcffeb5a	11	/** Represents an RGB color. */
sschocke	1:f07afcffeb5a	12	typedef struct rgb_color
sschocke	1:f07afcffeb5a	13	{
sschocke	1:f07afcffeb5a	14	uint8_t green; /!< A number between 0 and 255 that represents the brightness of the red component. /
sschocke	1:f07afcffeb5a	15	uint8_t red; /!< A number between 0 and 255 that represents the brightness of the green component. /
sschocke	1:f07afcffeb5a	16	uint8_t blue; /!< A number between 0 and 255 that represents the brightness of the blue component. /
sschocke	1:f07afcffeb5a	17	} rgb_color;
sschocke	1:f07afcffeb5a	18	#endif
sschocke	1:f07afcffeb5a	19
sschocke	1:f07afcffeb5a	20	extern "C" int led_strip_write_color(rgb_color , volatile uint16_t set, volatile uint16_t * clear, uint32_t mask);
sschocke	1:f07afcffeb5a	21
sschocke	1:f07afcffeb5a	22	/** This class lets you control the addressable RGB LED strips from Pololu</a>,
sschocke	1:f07afcffeb5a	23	or any other LED strip based on the TM1804 chip. */
sschocke	1:f07afcffeb5a	24	class PololuLedStrip
sschocke	1:f07afcffeb5a	25	{
sschocke	1:f07afcffeb5a	26	gpio_t gpio;
sschocke	1:f07afcffeb5a	27
sschocke	1:f07afcffeb5a	28	public:
sschocke	1:f07afcffeb5a	29
sschocke	1:f07afcffeb5a	30	/** This constructor lets you make an led strip object by specifying the pin name.
sschocke	1:f07afcffeb5a	31	There are no restrictions on what pin you can choose.
sschocke	1:f07afcffeb5a	32
sschocke	1:f07afcffeb5a	33	Example:
sschocke	1:f07afcffeb5a	34	@code
sschocke	1:f07afcffeb5a	35	PololuLedStrip ledStrip(p8);
sschocke	1:f07afcffeb5a	36	@endcode
sschocke	1:f07afcffeb5a	37	*/
sschocke	1:f07afcffeb5a	38	PololuLedStrip(PinName pin);
sschocke	1:f07afcffeb5a	39
sschocke	1:f07afcffeb5a	40	/** Writes the specified series of colors to the LED strip.
sschocke	1:f07afcffeb5a	41	@param colors should be a pointer to an array of rgb_color structs.
sschocke	1:f07afcffeb5a	42	@param count should be the number of colors to write.
sschocke	1:f07afcffeb5a	43
sschocke	1:f07afcffeb5a	44	The first color in the array will be written to the LED closest to the data input connector.
sschocke	1:f07afcffeb5a	45	To update all the LEDs in the LED strip, count should be equal to or greater than the number of LEDs in the strip.
sschocke	1:f07afcffeb5a	46	If count is less than the number of LEDs in the strip, then some LEDs near the end of the strip will not be updated.
sschocke	1:f07afcffeb5a	47
sschocke	1:f07afcffeb5a	48	The colors are sent in series and each color takes about 45 microseconds to send.
sschocke	1:f07afcffeb5a	49	This function disables interrupts temporarily while it is running.
sschocke	1:f07afcffeb5a	50	This function waits for over 10 us at the end before returning to allow the colors to take effect.
sschocke	1:f07afcffeb5a	51	*/
sschocke	1:f07afcffeb5a	52	void write(rgb_color * colors, unsigned int count);
sschocke	1:f07afcffeb5a	53
sschocke	1:f07afcffeb5a	54	/** This option defaults to <code>false</code>.
sschocke	1:f07afcffeb5a	55	Setting this to true changes the behavior of the write function, making it enable interrupts
sschocke	1:f07afcffeb5a	56	after each color is sent, about every 60 microseconds.
sschocke	1:f07afcffeb5a	57	This allows your program to respond to interrupts faster, but makes it possible for an interrupt
sschocke	1:f07afcffeb5a	58	that takes longer than 8 microseconds to screw up the transmission of colors to the LED strip.
sschocke	1:f07afcffeb5a	59
sschocke	1:f07afcffeb5a	60	Example:
sschocke	1:f07afcffeb5a	61	@code
sschocke	1:f07afcffeb5a	62	PololuLedStrip::interruptFriendly = true;
sschocke	1:f07afcffeb5a	63	@endcode
sschocke	1:f07afcffeb5a	64	*/
sschocke	1:f07afcffeb5a	65	static bool interruptFriendly;
sschocke	1:f07afcffeb5a	66
sschocke	1:f07afcffeb5a	67	static void calculateDelays();
sschocke	1:f07afcffeb5a	68	};
sschocke	1:f07afcffeb5a	69	}
sschocke	1:f07afcffeb5a	70
sschocke	1:f07afcffeb5a	71	using namespace Pololu;
sschocke	1:f07afcffeb5a	72
sschocke	1:f07afcffeb5a	73	#endif