ESP8266 Community Forum

- Thu Aug 04, 2016 10:24 am #52119 This is the code I'm using which is Roboremo code. So should I add GPIO low at start?

function stringStarts(a,b)
return string.sub(a,1,string.len(b))==b
end

function stringEnds(a,b)
return b=='' or string.sub(a,-string.len(b))==b
end

servo = {}
servo.pin = 4 --this is GPIO2
servo.value = 1500
servo.id = "servo"


cmd = ""

gpio.mode(servo.pin,gpio.OUTPUT)
gpio.write(servo.pin,gpio.LOW)

tmr.alarm(0,20,1,function() -- 50Hz
if servo.value then -- generate pulse
gpio.write(servo.pin, gpio.HIGH)
tmr.delay(servo.value)
gpio.write(servo.pin, gpio.LOW)
end
end)


function exeCmd(st) -- example: "servo 1500"
if stringStarts(st, servo.id.." ") then -- value comes after id + space
servo.value = tonumber( string.sub(st,1+string.len(servo.id.." "),string.len(st)) )
end
end


function receiveData(conn, data)
cmd = cmd .. data

local a, b = string.find(cmd, "\n", 1, true)
while a do
exeCmd( string.sub(cmd, 1, a-1) )
cmd = string.sub(cmd, a+1, string.len(cmd))
a, b = string.find(cmd, "\n", 1, true)
end
end


srv=net.createServer(net.TCP, 28800)
srv:listen(port,function(conn)
print("RoboRemo connected")
conn:send("dbg connected ok\n")

conn:on("receive",receiveData)

conn:on("disconnection",function(c)
print("RoboRemo disconnected")
end)

end)