So now we have: int shtime // turn-on start hour (0-24 format) int smtime // turn-on start minute (0-59 format) int sttime // turn-off hour (1-23 format) This last version introduces start hour and end hour. Wintertime switch will be at 3.00 the last sunday of october, summertime at same hour of the last sunday of march. Settings during winter time requires a TRUE value. If, at the time of settings, you are during summer time. Set variable boolean WTime=false // in case you are setting during summer time change to FALSE
Tutorial made assuming that DS3231 current time is already set and you already know Attiny85 programming using Arduino IDE. Nothing stop to set more shutdown ranges, if needed. Sleeptime=sleep time (number of hours format) sstime=3 sleeptime=2 //(because minimum default sleep time is 1 hour) In my specific case, i need that modem is powered off from 3 am to 6 am, then my settings are: Shutdown and duration time must be added into the sketch. The sketch is very minimal, it allow to shutdown device from 1 to N hours. Digging in my recycle box i've found a 12V 3A power supply that is more than enough for the use. When testing i discovered that 1Ampere was not enough to drive it and Tempo at the same time. The modem that i used to test Tempo has a 12V 1A power supply. A small current is drained by Tempo circuit, the remaining is for the device that you are feeding. There is a little voltage regulator circuit that allow input voltages from 7.5 to 35Volts so you can use power supply of the device to be controlled. Another main feature is that maximum current from Drain is 18Ampere but, usually, we'll only need at most 2-3Ampere.Īs said in the foreword, Tempo doesn't need of a power supply. This part allow a maximum drain-source voltage of 200Volts but, usually, we'll needs no more than 12Volts. The concept is simple, since we are talking to switch low power devices, i thought to replace a classic relay with a high current driving mosfet as IRF640. I'm using the latest version with Attiny85 running at 1Mhz.Īttiny85 is in charge to get current time from RTC and send an on/off control signal. As a result i had to modify the sketch to prevent error in case of power failure. This can be done via interrupt Attiny85 PIN and DS3231 built-in alarm function (two alarm programs available).
This allows to introduce SLEEP instruction that reduce TEMPO power consumption when no need. Rather than to consider the shutdown time, now has been considered turn-on time. The new version introduces substantial changes.
Now support automatic adjustment from summer to winter time and vice versa. I'm using it to drive modem and lan switches to create a "night mode" around my house. Once you add shutdown time and sleep duration into the sketch, Tempo will make its "dirty" work until the DS3231 button battery die. It doesn't need of a dedicated power supply, because drain current from device PS that you are powering with a few small adjustment. So i thought to build a digital timer, Attiny85 and DS3231 RTC based, for my low power DC devices. after a blackout it needs to be programmed.The one commonly used is the classic mechanical 24-hour timer. Very often we use timer switches to turn on/off our equipments.
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