Servo32 behaving unexpectedly
Jay Kickliter
Posts: 446
I have two servos connected to a PPDB. They're powered from VDD.
The strange thing is that only the first servo I set actually gets activated. Unplugging them and hooking up the signal lines to LEDs confirms that only the first servo set is receivng a signal, any after that are inactive. If I comment out the first servo.set(), then the next servo does get a signal. I've tried all the normal swapping and ohming troubleshooting, but I can't find anything.
The servo32 object seems pretty straight forward, but here's my code:
Anybody see anything?
The strange thing is that only the first servo I set actually gets activated. Unplugging them and hooking up the signal lines to LEDs confirms that only the first servo set is receivng a signal, any after that are inactive. If I comment out the first servo.set(), then the next servo does get a signal. I've tried all the normal swapping and ohming troubleshooting, but I can't find anything.
The servo32 object seems pretty straight forward, but here's my code:
CON
_clkmode = xtal1 + pll16x
_xinfreq = 5_000_000 'Note Clock Speed for your setup!!
CR = $0D
LF = $0A
PAN_SERVO = 12
TILT_SERVO = 14
VAR
word servoPanSetPoint, servoTiltSetPoint
byte rxByte, packetBuffer[noparse][[/noparse]20], validPacket
OBJ
servo : "Servo32v3"
serial : "FullDuplexSerial"
PUB main | i, temp
serial.start(31, 30, 0, 9600)
servo.start
servoPanSetPoint := 1100
servoTiltSetPoint := 1900
validPacket := 0
servo.set(PAN_SERVO, servoPanSetPoint)
servo.set(TILT_SERVO, servoTiltSetPoint)
repeat
if validPacket
serial.str(string("Setting pan to: "))
serial.dec(servoPanSetPoint)
serial.str(string(" and tilt to: "))
serial.dec(servoTiltSetPoint)
serial.tx(CR)
servo.set(PAN_SERVO, servoPanSetPoint)
servo.set(TILT_SERVO, servoTiltSetPoint)
i := 0
temp := 0
repeat until serial.rx == "@"
repeat until (rxByte := serial.rx) == ","
temp := temp * 10 + (rxByte - "0")
servoPanSetPoint := 1000 #> temp <# 2000
temp := 0
repeat until (rxByte := serial.rx) == 13 or rxByte == 10
temp := temp * 10 + (rxByte - "0")
servoTiltSetPoint := 1000 #> temp <# 2000
validPacket := 1
Anybody see anything?
Comments
Leon
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Amateur radio callsign: G1HSM
Suzuki SV1000S motorcycle
To initialize the servo32 object, you need to initialize "servo.set" before you initialize "servo.start"...· This is a safety feature that presets the servo position to a known state, and tells the servo object which pins will be used for the servo(s).
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Beau Schwabe
IC Layout Engineer
Parallax, Inc.