Heater element controller with Arduino - Not the same problem as always!

hello

im new arduino programing.

i have project in which  have control heater element. requirements temperature has increase +20°c ambient (20-22°c) @ rate of 5°c/min. after that, has wait 2 min or until temperature reaches again ambient. cycle has repeat 4 times.

i have heating coil can control trough relay , lm35 temperature sensor.
 
i have arduino uno atmega 328-p

the problem have dont know how guarantee rate. have found far reach temperature without time requirements.

if me solve problem, appreciate it!!

thanks in advance!

quote

the requirements temperature has increase +20°c ambient (20-22°c) @ rate of 5°c/min.

first, make sure heating element capable of rising fast.

then "think digitally".     increment in 1 degree or 1/10 of degree steps, etc.  (you'll have calculate steps per minute).

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