sparkfun AST-CAN485 Documento técnico
AST-CAN485 WiFi Shield Hookup Guide
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
A
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.
A
ST-CAN485 Hookup Guide
MARCH 1, 201
8
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
A
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
h
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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