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diff --git a/sw/pins.hpp b/sw/pins.hpp
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+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Matthias P. Braendli
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+
+#pragma once
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+// Definitions allocation pin
+
+/* All relay signals PINx_Kx have external pulldown.
+ * All pins whose name ends in 'n' are active low */
+
+// For arduino pin numbers (not used in this file), see
+// lib/pins_arduino.h
+
+// PORT B
+constexpr uint8_t PINB_STATUSn = _BV(0);
+// Pins 2,3,4,5 = SPI
+constexpr uint8_t PINB_SPI_LTC_CSn = _BV(2); // with external pullup
+constexpr uint8_t PINB_SPI_MOSI = _BV(3);
+constexpr uint8_t PINB_SPI_MISO = _BV(4);
+constexpr uint8_t PINB_SPI_SCK = _BV(5);
+
+constexpr uint8_t PINB_OUTPUTS =
+    PINB_STATUSn | PINB_SPI_SCK | PINB_SPI_MOSI | PINB_SPI_LTC_CSn;
+
+constexpr uint8_t PINB_INIT =
+    PINB_STATUSn | PINB_SPI_LTC_CSn;
+
+// PORT C
+constexpr uint8_t PINC_ADC0 = _BV(0);
+constexpr uint8_t PINC_ADC1 = _BV(1);
+constexpr uint8_t PINC_K3_RESET = _BV(2);
+constexpr uint8_t PINC_K3_SET = _BV(3);
+constexpr uint8_t PINC_K2_RESET = _BV(4);
+constexpr uint8_t PINC_K2_SET = _BV(5);
+
+constexpr uint8_t PINC_OUTPUTS =
+    PINC_K3_RESET | PINC_K3_SET |
+    PINC_K2_RESET | PINC_K2_SET;
+
+constexpr uint8_t PINC_INIT = 0;
+
+// PORT D
+// Pins 0,1 = UART RX,TX
+constexpr uint8_t PIND_UART_RX = _BV(0);
+constexpr uint8_t PIND_UART_TX = _BV(1);
+
+constexpr uint8_t PIND_ONEWIRE = _BV(4); // with exteral pullup
+
+constexpr uint8_t PIND_K1_RESET = _BV(5);
+constexpr uint8_t PIND_K1_SET = _BV(6);
+
+constexpr uint8_t PIND_OUTPUTS =
+    PIND_UART_TX |
+    PIND_K1_RESET | PIND_K1_SET;
+
+constexpr uint8_t PIND_INIT = 0;
+
+inline void pins_set_status(bool enable)
+{
+    if (enable) {
+        PORTB &= ~PINB_STATUSn;
+    }
+    else {
+        PORTB |= PINB_STATUSn;
+    }
+}
+