From 549f532148224061811564a83bc32d68f99488ce Mon Sep 17 00:00:00 2001
From: Mobilinkd LLC <mobilinkd@gmail.com>
Date: Mon, 11 Feb 2019 21:36:12 -0600
Subject: [PATCH 1/2] Update README.md

Start adding build instructions.
---
 README.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/README.md b/README.md
index 134f287..fb184b2 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,18 @@
 # nucleo32-l432kc-tnc-firmware
 Source code for breadboard TNC based on STM32L432KC Nucleo32 dev board
+
+# Build Instructions for the Breadboard TNC3
+
+The Breadboard TNC3 is a TNC based on the microcontroller family and firmware
+used in the Mobilinkd TNC3.  The breadboard TNC3 contains the microcontroller,
+audio input and output circuitry, PTT signalling circuitry and EEPROM for
+storing configuration that is nearly identical to the TNC3.  It only lacks the
+Bluetooth adapter and battery charging circuitry.
+
+## Bill of Materials
+
+The Breadboard TNC3 is designed around the STMicroelectronics Nucleo32 board
+with the STM32L432KC chip.  The total bill of materials (BOM) cost is about
+$25 (USD).
+
+You will need:

From c8567131e64c2d77ac182f6b337607506c1024dd Mon Sep 17 00:00:00 2001
From: Mobilinkd LLC <mobilinkd@gmail.com>
Date: Mon, 11 Feb 2019 22:05:10 -0600
Subject: [PATCH 2/2] Update README.md

---
 README.md | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/README.md b/README.md
index fb184b2..20146a6 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,9 @@ audio input and output circuitry, PTT signalling circuitry and EEPROM for
 storing configuration that is nearly identical to the TNC3.  It only lacks the
 Bluetooth adapter and battery charging circuitry.
 
+The Breadboard TNC3 connects to a computer (or Android device with a USB-OTG
+adapter) via a USB cable.
+
 ## Bill of Materials
 
 The Breadboard TNC3 is designed around the STMicroelectronics Nucleo32 board
@@ -16,3 +19,27 @@ with the STM32L432KC chip.  The total bill of materials (BOM) cost is about
 $25 (USD).
 
 You will need:
+
+ - 830-point breadboard (standard single row) or larger.
+ - STM Nucleo32-L432KC dev board
+ - 2 2N7009 N-channel MOSFETs (TO-92)
+ - 2 Schottky diodes
+ - 1 MCP6004 4-channel op amp (14-PDIP)
+ - 1 AT24C32E-PUM 32kb I2C EEPROM (8-PDIP)
+ - 1 Red LED
+ - 1 Green LED
+ - 1 TRRS 3.5mm 4-pole jack
+ - various resistors and capacitors
+ - Hookup wire
+ 
+## Schematic Diagram
+
+## Theory of Operation
+
+## Build Instructions
+
+## Progarmming the Breadboard TNC3
+
+## Running the Test Program
+
+