diff --git a/.gitignore b/.gitignore
index e1c0d0a..fbd5315 100644
--- a/.gitignore
+++ b/.gitignore
@@ -51,3 +51,4 @@ Icon
 
 # Project specific
 /build
+sdkconfig.old
diff --git a/EDA/ChangeLog b/EDA/ChangeLog.md
similarity index 81%
rename from EDA/ChangeLog
rename to EDA/ChangeLog.md
index 06237a3..11eaf67 100644
--- a/EDA/ChangeLog
+++ b/EDA/ChangeLog.md
@@ -1,15 +1,18 @@
-### v1.2
+#### Unreleased
+- testing blue PCB
+
+#### PCB 1.2
 - moved a few labels around the silk layer
 - moved the ADB socket out by 2mm
 - tone down LEDs by about 50% (christmas is over)
 - replaced TXB0108PWR by TXS0108EPWR
 
-### v1.1
+#### PCB 1.1
 - added beads to reduce EMI
 - fixed missong OE on TXB0108
 - tone down LEDs by about 20%
 - fixed Pick&Place rotations
 - added PCB Antenna
 
-### v1.0
+#### PCB 1.0
 - Initial board release
diff --git a/main/adb.h b/main/adb.h
new file mode 100644
index 0000000..237b852
--- /dev/null
+++ b/main/adb.h
@@ -0,0 +1,44 @@
+/*
+ *  adb.h
+ *  quack
+ *
+ *  Created by Michel DEPEIGE on 7/01/2021.
+ *  Copyright (c) 2020 Michel DEPEIGE.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (see the file COPYING); if not, write to the
+ * Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
+ *
+ */
+
+#ifndef ADB_H
+#define ADB_H
+
+/* prototypes */
+void	adb_init(void);
+void    adb_task_host(void *pvParameters);
+void    adb_task_mouse(void *pvParameters);
+
+void	adb_tx_cmd(unsigned char cmd);
+void	adb_tx_reset(void);
+
+/* defines */
+
+/* ADB commands values from 00591b.pdf page 16-17 */
+#define ADB_MOUSE	(3<<4)
+#define ADB_TALK	0xC
+#define ADB_LISTEN	0x8
+#define ADB_REG0	0x0
+
+#endif