Sparkfun AST-CAN485 Technisches Dokument

AST-CAN485 WiFi Shield Hookup Guide

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Introduction

What would make the AST-CAN485 even better? WiFi! In order to further the communications

capabilities of the CAN485, we present the AST-CAN485 Wifi Shield. The shield is based on the

Sparkfun ESP8266 thing and allows for a CAN485 module to communicate over Wifi.

SparkFun AST-CAN485 WiFi Shield

WRL-14597

…

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AST-CAN485 WiFi Shield Hookup Guide Wishlist SparkFun Wish List

Required Materials

To follow along with this tutorial, you will need the following materials. You may not need everything

though depending on what you have. Add it to your cart, read through the guide, and adjust the cart as

necessary.

SparkFun AST-CAN485 WiFi Shield

WRL-14597

SparkFun FTDI Basic Breakout - 3.3V

DEV-09873

This is the newest revision of our [FTDI Basic](http://www.sparkfun.com/commerce/product_info.php?…

SparkFun FTDI Basic Breakout - 5V

DEV-09716

This is the newest revision of our [FTDI Basic](https://www.sparkfun.com/products/retired/9115). We n…

SparkFun USB Mini-B Cable - 6 Foot

CAB-11301

This is a USB 2.0 type A to Mini-B 5-pin cable. You know, the mini-B connector that usually comes wit…

Break Away Headers - Straight

PRT-00116

row of headers - break to fit. 40 pins that can be cut to any size. Used with custom PCBs or general…

SparkFun AST-CAN485 Dev Board

DEV-14483

Tools

Depending on your setup, you will need a soldering iron, solder, and general soldering accessories to

solder pins to the AST-CAN485. You will also need a flat head and wire strippers to connect wires to

the screw terminals.

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Suggested Reading

We recommend checking out the AST-CAN485 Hookup Guide to get started with the board. Depending

on your setup, you may need to install custom libraries and board add-ons.

Soldering Iron - 60W (Adjustable

Temperature)

TOL-14456

Solder Lead Free - 15-gram Tube

TOL-09163

Pocket Screwdriver Set

TOL-12891

Wire Strippers - 20-30AWG

TOL-14763

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If you aren’t familiar with the following concepts, we also recommend checking out these tutorials

before continuing.

ST-CAN485 Hookup Guide

MARCH 1, 201

The AST CAN485 is a miniature Arduino in the compact form factor of the

ProMini. In addition to all the usual features it has on-board CAN and RS485

ports enabling quick and easy interfacing to a multitude of industrial devices.

Working with Wire

How to strip, crimp, and work with wire.

ESP8266 Thing Development Board

Hookup Guide

n overview of SparkFun's ESP8266 Thing

Development Board - a development board for the

Internet of Things.

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Hardware Overview

Input Power

The AST-CAN485 WiFi Shield provides screw terminals for your power, RS-485 signals, and CAN bus

signals, presoldered to the board for fast and secure connections.

The input voltage range is 7-24VDC. The input voltage is regulated down to 5V to supply power the

CAN485 board, as well as 3.3V to power the ESP8266.

Three Quick Tips About Using U.FL

Quick tips regarding how to connect, protect, and

disconnect U.FL connectors.

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ESP8266

Based on the SparkFun ESP8266 Thing, you can use either the PCB trace antenna, or the U.FL

connector if housed in a metal enclosure.

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Programming Switc

Because the UARTs are connected together for the CAN485 board and the ESP8266, a switch is used

to separate the RX and TX signals. When programing either the ESP8266 or CAN485 board, move the

switch over to the PROG position, and after the upload is complete, toggle the switch to the RUN

position.

Speaking of programming, the ESP8266 runs off of 3.3V logic, so to program the ESP8266, a 3.3V

USB to UART bridge is used.

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AST-CAN485 Serial Port

A header breaks out the Software Serial port used by the CAN485. This can be used as a debugging

serial port or to connect other devices.

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Pinouts

The pinout for the WiFi Shield is shown below:

Image courtesy of AST

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⚡Warning! This board has pins that operate at 24V as well as pins that operate at 5V and 3.3V.

Care should be taken during wiring as 24V has the potential to do significant damage to 5V and

3.3V circuits.

Schematic

The schematic below shows the layout of the interconnects between an inserted CAN485 module and

the integrated ESP module.

Image courtesy of AST

The primary interface between the CAN485 and the ESP8266 is a serial port. It operates on hardware

serial port 0 on the CAN485 rather than the traditional Software Serial port. The reason for this is that it

enables higher speed communications between the two devices. The trade-off of this feature is that it

uses the main serial port, which is also used to program the CAN485 and is broken out on its FTDI

header. This means that in order to program the CAN485 module, while it is inserted, the serial port

must be disconnected. For this reason, the mode selection switch was added which allows for the rx

and tx lines to be disconnected. In a similar way, the same serial port is used to both program the

ESP8266 and communicate with the CAN485. The mode selection switch also enables the ESP to be

programmed by disconnecting it from the CAN485.

Hardware Hookup

The AST-CAN485 WiFi Shield comes with headers pre-soldered to the board. Insert the CAN485 as

shown with the CAN485's FTDI header close to the ESP8266.

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