Update README.md

1 files changed, 14 insertions, 11 deletions

diff --git a/README.md b/README.md
index 17a37c8..69b9fde 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,18 @@ Penny is a tremendous fun!
 Penny has two elder sisters, [Penny](https://youtu.be/7Py03SH5DbE) and [Penny](https://youtu.be/PiVTC8JhZTQ). Note that I have no hardware contributions, all I did is to gather the information, assemble things and write the firmware. I want this wonderful robot to be easy to clone, therefore I created this repository. The original Penny#1 is created by [Jeremy Zimmer](https://www.robotshop.com/community/robots/show/penny). The wiring being cumbersome and cheapduino being discontinued, Dennis van Elteren has designed the motherboard that I also use. Thus Penny#2 was born. Here I present you Penny#3. While I have Dennis' sanction to publish his files, I failed to contact Jeremy. The software, however is distributed under the DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE.
 
 # How to clone
+## Bill of materials
+Printing the body costs next to nothing if you have a 3d printer. Here are the main things you need to build the bot:
+* The motherboard. You can either etch it by yourself, or you can check chinese factories, any normal day it costs ~10€ / 10 pcs (shipping included), with discounts it can cost 2€ / 10 pcs. You can find an alternative like cheapduino or similar, because the schematics is very, very basic.
+* [SG90 9G micro servo, 3 * 1.47€ / piece](https://www.aliexpress.com/item/4000595327297.html)
+* [4x AAA battery holder, 1.34€ / piece](https://www.aliexpress.com/item/33049875634.html)
+* [ATMega8A-AU (QFP-32), 1€ / piece](https://www.aliexpress.com/item/32557093316.html)
+* [IR LED + IR phototransistor, 0.20€ / pair](https://www.aliexpress.com/item/32849824664.html)
+* [Electrolytic capacitor 1000uF 16V, 0.17€ / piece](https://www.aliexpress.com/item/32954075821.html)
+* [2n3904 transistor, 3 * 0.01€ / piece](https://www.aliexpress.com/item/32494899564.html)
+* You will need wires, heat shrink, screws, pin headers, few 0805 resistors and capacitors. All electronic components are listed in the [hardware/motherboard/BOM.html](https://github.com/ssloy/penny/blob/master/hardware/motherboard/BOM.html) file.
+
+
 ## The body
 It is quite straightforward, if you have a printer, just print it. You can find the files in the [hardware/body/](https://github.com/ssloy/penny/tree/master/hardware/body) folder. All the body parts are shown here:
 
@@ -37,17 +49,6 @@ I recommend soldering the bare minimum to power up the processor, and to flash i
 
 ![](https://raw.githubusercontent.com/ssloy/penny/master/doc/penny_motherboard_mcu.jpg)
 
-### Bill of materials
-Printing the body costs next to nothing if you have a 3d printer. Here are the main things you need to build the bot:
-* The motherboard. You can either etch it by yourself, or you can check chinese factories, any normal day it costs ~10€ / 10 pcs (shipping included), with discounts it can cost 2€ / 10 pcs.
-* [SG90 9G micro servo, 3 * 1.47€ / piece](https://www.aliexpress.com/item/4000595327297.html)
-* [4x AAA battery holder, 1.34€ / piece](https://www.aliexpress.com/item/33049875634.html)
-* [ATMega8A-AU (QFP-32), 1€ / piece](https://www.aliexpress.com/item/32557093316.html)
-* [IR LED + IR phototransistor, 0.20€ / pair](https://www.aliexpress.com/item/32849824664.html)
-* [Electrolytic capacitor 1000uF 16V, 0.17€ / piece](https://www.aliexpress.com/item/32954075821.html)
-* [2n3904 transistor, 3 * 0.01€ / piece](https://www.aliexpress.com/item/32494899564.html)
-* You will need wires, heat shrink, screws, pin headers, few 0805 resistors and capacitors.
-
 
 ### The proximity sensor
 ![](https://raw.githubusercontent.com/ssloy/penny/master/doc/pcb-proximity-sensor.png)
@@ -65,3 +66,5 @@ If you are a good soul willing to create a V2 of the motherboard, you are very w
 * Add test pads easy to access with an oscilloscope;
 * Add a couple of debug LEDs;
 * Create good soldering points for unused ATMega8 pins for debugging and further extension.
+
+I guess that it would be a good idea to port the code to arduino environment for those who do not want to call avr-gcc directly. If you can do it, send me a pull request.