43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/* This is the main part of the waschkarte auflader program.
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*/
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/* peripherals */
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/* LED to indicate scale reading
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* pin: PB5, LED L
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*/
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#define LED PB5
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/* high when the scale is on
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* pin: PD5, PCINT21, D5
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*/
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#define SCALE_ON PD5
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/* PWM weight signal
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* PWM frequency is ~3Hz
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* high time increases with increasing weight (propotionnally)
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* low time decreases with increasing weight
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* signal level is 1V
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* positive pin of analog comparator used to measure PWM
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* pin: PD6, AIN0, D6
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*/
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#define SCALE_PWM PD6
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/* negative pin of analog comparator
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* set at 0.2-0.8V using voltage divider
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* used to detect PWM signal change
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* pin: PD7, AIN1, D7
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*/
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#define REF_PWM PD7
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