#REM  Li-Ion Battery Management System Remote Monitor & PC Data Logging Module
By Peter Perkins. Picaxe 08M - PIC12F683 - 210809 - www.150mpg.co.uk - V0.02 
**************************** General Information ******************************

The BMS modules carry no warranty or guarantee of any kind! They are used at
your own risk, and I make no claims as to their suitability for a particular
function. Prospective users must evaluate the system before using it, and no
liability will be entertained by myself in any shape or form whatsoever.
The modules and software have been produced at low cost for the benefit of
the EV & electronic community. The software is available free via the internet.
Users may modify or adapt the system as they see fit. If you are not fully
competent to work on potentially lethal battery systems and high voltages,
then do not experiment with or use this system. Be aware that vehicle
modifications can lead to invalidated insurance and warranty issues. You the
end user remain fully liable for any modifications made to your vehicle.   

******************** Remote Display Picaxe 08M Pinouts ************************

                                    Top					
                                   _____
(+ Supply)                  +Ve -1|  ^  |8- -Ve                    (- Supply)
(Program In)                Rxd -2|  0  |7- Txd     (Program Out & Txd to Pc)
(Not Used)             Output 4 -3|  8  |6- Output 1               (Not used)
(Rxd Serial Data In)    Input 3 -4|  M  |5- Output 2        (Data OK Led Out) 
                                   ----- 

********************** Watchdog Module Specification **************************

Supply Voltage 5.00V DC same as Master
Average Supply Current at 5.00v <5ma
CPU Speed 4mhz with internal resonator
2400 baud serial comms via 433mhz wireless link with Master
Wireless range 75M approx 
Audible alarm sounds 0-5 seconds after Alarm received or data/signal failure
Alarm delay 0-5 seconds adjustable via 100k pot

*******************************************************************************
*********************** Program Size 50 out of 256 Bytes **********************
*******************************************************************************

#ENDREM

#picaxe 08M			;Set editor to Picaxe 08M Mode

`Variables Constants and I/O definitions

`Variables 
		
`Variables 8bit (Byte)		;Note some Word variables converted to byte variables by Master
				;for transmission to remote display to save variables 

symbol AlarmByte    =   b0 	;Alarm Type Byte (0-255 number of different Alarms) 
symbol AlarmCount   =   b1      ;Alarm Counter Byte (0-255 number of times an Alarm has occured)  
symbol Temp1	    =   b2	;Temp1 Sensor LM335 (0-100C)
symbol Temp2 	    =   b3	;Temp2 Sensor LM335 (0-100C)
symbol PackVoltage  =   b4 	;Pack Voltage (0-255V) 
symbol Soc          =   b5 	;Pack Capacity (0-255Ah) Rounded down to nearest Ah
symbol ErrCell      =   b6      ;Number of the Cell with any Error condition

`AlarmByte (b0)	 Additional Information (255 possible Alarms) 0 = No Alarms

`If AlarmByte = 0 then (No Alarms Set)
`If AlarmByte = 1 then (Cell over AbsMax V)
`If AlarmByte = 2 then (Cell under AbsMin V)
`If AlarmByte = 3 then (Cell data serial transfer timeout error)
`If AlarmByte = 4 then (Battery Pack over AbsMax Temp)
`If AlarmByte = 5 then (Alarm Test Condition) Used to simulate Alarms


`Constants

symbol Delay 	     = 50   	;Pause for 50ms at 4mhz
symbol AlarmActivate = 2	;Times Alarm must occur before Alarm activates (Must be set same as in Master)	

`Pins used for I/O and designations

`*** Digital high/low Outputs ***

symbol Txd	     = 0	;Serial 4800 baud out to PC via prog cable on Output 0
`symbol Not Used     = 1	;Not Used on Output 1
symbol Led           = 2	;Data OK Led on Output 2
`symbol Not Used     = 4	;Not Used on Output 4

`*** Digital high/low Inputs ***

symbol Rxd           = 3	;Serial 2400 baud in from Master via 433mhz link on Input 3

`*******************************************************************************
`*******************************************************************************

Start:							;Program Start

	high led					;Turn off data Led (Sink driven)
		
	serin Rxd,N2400,("bms"),b0,b1,b2,b3,b4,b5,b6	;Receive data via 433mhz radio link from Master

	sertxd(#b0," ",#b1," ",#b2," ",#b3," ",#b4," ",#b5," ",#b6)		;Transmit data to PC via programming lead

	if AlarmCount >= AlarmActivate then Alarms	;If AlarmsCount >= AlarmActivate then	

	low led						;Turn on data Led (Sink driven)

	pause Delay					;Pause for 50ms at 4mhz
	
	goto Start					;Goto program start	
	
Alarms:							;Program ends here if Alarm Condition
							;Must be reset by cycling power off/on