Download Circuit Cellar June 2010 by Steve Ciarcia PDF

By Steve Ciarcia

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It can be selectively populated as cable enables you to program the PIC with any needed. Two different relays fit into the PCB footprint, for either 2-A or 8-A currentswitching capabilities. standard PIC programmer that supports ICSP. c. At the top are variable declarations. At the bottom are entries in the object dictionary. e. 500 = 500ms rom UNSIGNED16 Relais_Time = 500; /******* Index 0x2001 ********************************/ //How many Switches are installed and in use, needs to be 1 ... 3 rom UNSIGNED8 SwitchCount = 3; /******* Index 0x2002 ********************************/ //How many Relais are installed and in use, range is 0 ...

User_ProcessMain: If New Open Collector PDO has been received: Set respective Open Collector output /******************************************************************************* User_Process1msIsr - 1 ms USER TIMER FUNCTION Function is executed every 1 ms. It is deterministic and has priority over mainline functions. *******************************************************************************/ User_Process1msIsr: IF we are not in debounce mode //map RPDOs onto LEDS and check switches // Three different situations depending on the number of switches SWITCH(SwitchCount) case 1: //This is the config with 1 Switch and 0 or 1 Relais IF low edge on any of the three TouchSwitches toggle status and relay on or off as appropriate If Switch Status is OFF Toggle Status to ON IF Relay 1 exists, activate coil to turn on ELSE Toggle Status to OFF IF Relay 1 exists, activate coil to turn off Send PDO 0 message to inform every node who cares Set the LEDs ENDIF // if any switch touched IF PDO 0 has been received toggle status and relay on or off as appropriate set the LEDs ENDIF// PDO 0 received Start the timer for debounce, Relais and LED End CASE 1 CASE 2: // Config with two switches and 0 to 2 Relais … similar to case one with different mapping, see actual code CASE 3: // Config with three switches and 0 to 2 Relais … similar to case one with different mapping, see actual code ENDIF// not in de-bounce mode June 2010 – Issue 239 // this is what we do while debounce is active ELSE //we are in debounce mode, count down timer Decrement timer by 1 IF Timer ==0 turn off all relays quit debounce mode ENDIF // timer expired ENDELSE// timer counting down } 34 the entire family agrees that this is the most comfortable climate-control system we have ever lived with, particularly in terms of no-draft heating and cooling as well as noise.

Each histogram character shows the number of pulses during that 20-ms interval: the counting sequence starts with a period for zero counts, then proceeds 1-9, A-Z, a-z, and stalls with a tilde (~) for counts beyond 61. Remember that synchronizing to the signal requires at least two consecutive error-free minutes! widths simply increment Glitchiness. The firmware does not measure the duration from the end of one PWM pulse to the start of the next, nor does it insist that pulses start exactly 1 s apart.

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