SingleChannelPWMNode

Project Main Page > This Page

Introduction:

This was the first HsNet node ever created (it's not like we have a lot of them right now, but it just felt appropriate )! It's a PWM controller originally designed for the D3's project ("hidden shapes backlit wall" http://www.hackeneering.com/?q=node/18).
It's objectives are:

• Switch up to 4Amps loads
• Provide the Master with smooth transitions between PWM levels (with variable transition speed)

The Results

Pictures of them: http://www.flickr.com/photos/hackeneering/sets/72157626403115344/show/
Video of it in action : http://vimeo.com/18570263

Hardware Schematics :

Link	Revision	note	Format
Download	rev3	Powered by a Pic12F683 featuring a TIP122	PDF

Firmware Source Code:

Link	Revision	note	Compiler
Download	rev16	first public release	CCS PICC

Implemented Commands documentation:

• Default Commands
• Node Commands:

Command	CMD_SET_PWM_TARGET
Cmd Field Value	0x10
Command description	Sets the desired target PWM value
Payload size	1 bytes
Payload description	Unsigned Char TARGET (between 0 (PWM off) and 124 (PWM Max))
returns as ack	empty ACK packet

Command	CMD_SET_PWM_SPEED
Cmd Field Value	0x11
Command description	Sets the desired PWM delay between steps in ms (16bit).
Payload size	2 bytes
Payload description	Unsigned Char DELAY_MSB
	Unsigned Char DELAY_LSB
returns as ack	empty ACK packet
example	The delay of "0x0001" is the fastest (should take the PWM controller ~100ms to get from 0% to 100%)
	The delay of "0x000A" should take ~1s to get from 0% to 100%

Command	CMD_SET_PWM_BLINK
Cmd Field Value	0x16
Command description	Turns the blinking mode on. Smooth looping transitions between two pwm values. To exit blinking mode use the CMD_SET_PWM_TARGET command
Payload size	2 bytes
Payload description	Unsigned Char PWM_LOW - "lowest" pwm value
	Unsigned Char PWM_HIGH - "highest" pwm value
returns as ack	empty ACK packet

---