serial

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+
+tobuy:
+- http://www.banggood.com/5pcs-L293D-L293-L293B-DIP-SOP-Push-Pull-Four-Channel-Motor-Driver-IC-p-944989.html
+- http://www.banggood.com/100-Pcs-SS8550-Transistor-1_5A-25V-PNP-TO-92-High-Current-p-974088.html
+- npn http://www.banggood.com/100Pcs-MOTON-3Pin-2N2222A-2N2222-Transistor-40V-300MHz-600mA-p-943227.html
+- http://www.banggood.com/600-Pcs-15-Value-x-40-Pcs-Transistor-TO-92-Assortment-Box-Kit-With-Box-p-911338.html
+- http://www.banggood.com/10-Pcs-3_3V-5V-TTL-Bi-directional-Logic-Level-Converter-For-Arduino-p-951181.html
+- multimetri
+
+
+
+Schede:
+- Teensy distributori: https://forum.pjrc.com/threads/23601-Official-Distributors
+- https://www.pjrc.com/teensy/teensyLC.html
+- https://www.pjrc.com/teensy/teensy31.html
+  http://www.robot-italy.com/it/teensy-3-1.html
+- http://www.pinguino.cc/shop/index.php?route=product/product&product_id=60
+- http://www.st.com/web/catalog/tools/FM116/SC959/SS1532/LN1847/PF259997
+
+Schede ESP8266
+- http://www.banggood.com/ESP8266-ESP-201-Remote-Serial-Port-WIFI-Transceiver-Wireless-Module-p-964288.html
+- http://www.banggood.com/NodeMcu-Lua-WIFI-Development-Board-For-ESP8266-Module-p-976440.html
+
+Ardupilot:
+- http://hobbyking.com/hobbyking/store/__55561__HKPilot32_Autonomous_Vehicle_32Bit_Control_Set_w_Power_Module.html 
+Con GPS - Flow control 
+
+
+- Chip
+- MCP23008 - i2c 8 input/output port expander
+- MCP23017 - i2c 16 input/output port expander http://www.aliexpress.com/item/10PCS-MCP23017-E-SP-MCP23017-E-MCP23017-DIP28/32253918768.html

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+Seriale
+=============
+
+Teoria: https://itp.nyu.edu/physcomp/lessons/serial-communication/serial-communication-the-basics/
+- https://itp.nyu.edu/physcomp/labs/labs-serial-communication/serial-output-from-an-arduino/
+
+
+per monitor seriale:  randterm.py
+
+
+I2C
+=======
+
+I2C Teoria: https://learn.sparkfun.com/tutorials/i2c
+Pratica: http://jamesreubenknowles.com/arduino-i2c-1680

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diff --git a/step_pins b/step_pins
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+Pin on top, olastica sotto
+
+    1  2    2 5 1 3   1 e' il piu' vicino al capacitor
+    3  4