Micro Monitor

Author: Jared Bouck

Project Cost: $20.00 – $25.00

Est Construction Time: 1.5 – 2.5 Hr

Required Skill Level: You’re going to need to be able to solder…

Overview:

This is a project I did a few years ago that I am dusting off for all you makers out there. This project is titled the Micro Monitor and it is a simple but powerful board. The core of this project is an ATMEGA 328 running the Arduino platform and an ENC28J60 Media Controller chip that creates a simple to use Ethernet capability for this board.

In addition the board includes a small suite of sensors that have been added to a tab on the side of the board so that the onboard sensors are more accurate, including a Temperature sensor, Humidity sensor and Light detecting Resistor. We also added in a push button that can be configured for anything you want (silence a audible alarm?), piezo buzzer, status led,  two Jumpers with pull down resistors, a 10K ohm Potentiometer (used for tuning thermal or light sensors?) and an additional RJ45 Jack that is designed to connect to a multiplexer for even more expandability.

This is a very easy to build, hack and use board and we have included everything you need to build this yourself! Don’t be afraid to remove or modify any parts you don’t need or want to use.

***** If you like this and would like to see us put together a board order or Kits let us know in the comments below. If we get enough feedback we will get a production run ordered.

 

 The Board:

At the bottom of the page you will find all the cad files for the chassis, eagle files for the board and example app code.

The board is roughly 2.5″ X 5.5″ and is almost entirely hole through components making it easy for the novice maker. The humidity sensor is the one Surface mount component but is extremely easy to add.

Board Etchings and Paths

 

 

 

Click the diagram above for a larger version.

 

 

BOM:

Bill of materials. This should be about everything. I have used and prefer both Mouser and Newark, but shop around for the best prices and substitutions.

Component	Description	Part Number	Quantity	ID on board
Buzzer	PC Mount 12mm 2.048kHz	MULTICOMP – MCKPX-G1205A-3700	1	SPKR1
Capacitor – Ceramic	100nF	NICHICON – UVR1A101MDD1TD	1	C4
Capacitor – Ceramic	18pF	MULTICOMP – MC0805N180J500A2.54MM	4	C1, C2, C6, C7
Capacitor – Ceramic	100nF	NICHICON – UVR1A101MDD1TD	2	C8, C9
Capacitor – Electrolytic	10uF	MULTICOMP – MCRH16V106M5X11	4	C3, C5, C10, C11
Crystal	16MHZ	MULTICOMP – HC49S-16-30-50-70-30-ATF	1	X1
Crystal	25MHZ	MULTICOMP – MCRS025000F183000RR	1	X2
DC Barrel Power Jack	5mm jack, with a 2.1mm center pole	CLIFF ELECTRONIC COMPONENTS – DC10A	1	Con1
Diode	1N4004	Y GENERAL SEMICONDUCTOR – 1N4004-E3/54	1	D1
Dip Socket	28 pin	MULTICOMP – SPC15504	2	IC1, IC2
Ethernet Jack	Mag-Jack Type Connector	We will provide this component	1	J1
Ferrite Bead	6mm Axial EMI RFI Suppression	FAIR-RITE – 2743015112	1	L1
Header Pins	2 pin	MULTICOMP – 2211S-02G	2	H3, H4
Humidity Sensor	HIH-4030	HONEYWELL S&C – HIH-4030-001	1	IC5
LED	5mm – Green	MULTICOMP – MCL053GD	4	D2, D3, D4, D5
Mini Photocell	PHOTOCELL 3K-11K OHM 5.10MM	Advanced Photonix Inc – PDV-P8001	1	LDR
Programming Header	6 Pin Header	MULTICOMP – 2211S-06G	1	H1
Push Button	Right Angle	MULTICOMP – MCDTSA6-5N	2	SW1, SW2
Quad AND Gate	Logic Converter	STMICROELECTRONICS – M74HC08B1R	1	IC3
Resistor – 1/4 watt	330 Ohm	MULTICOMP – MCF 0.25W 330R	5	R4, R12, R13, R16, R19
Resistor – 1/4 watt	2K OHM	MULTICOMP – MCCFR0W4J0202A50	1	R11
Resistor – 1/4 watt	10K Ohm	MULTICOMP – MCF 0.25W 10K	6	R1, R2, R3, R14, R15, R17, R18
Resistor – 1/4 watt	49.9K Ohm	INTERNATIONAL RESISTIVE – CMF1/44992FLFTR	4	R5, R6, R7, R8
Resistor – 1/4 watt	270R	MULTICOMP – MCF 0.25W 270R	2	R9, R10
RJ45 Jack	8-Pin Connector Unshielded	MULTICOMP – MTJ-881X1	1	J2
Temperature Sensor	LM35	MICROCHIP – MCP9701A-E/TO	1	IC4
Trimpot	10K ohm	TE CONNECTIVITY / CITEC – CT6V103N	1	P1
Voltage Regulator	TO-220 / 7805a	STMICROELECTRONICS – L7805ABV	1	U2
Voltage Regulator	78L33	STMICROELECTRONICS – L78L33ACZ	1	U4

 

 

Board Component Placement

 

 

Here is a shot of the top Silk Screen. This was a prototype board we had made with Advanced Circuits http://www.4pcb.com/

 

 

And the back of the same board.

 

 

Here we have all the components mounted on the board.

 

 

Solder joints for you all to see!

 

Laser cut chassis. Pattern is below. We use our own laser cutter but this will fit on the small sheet if you use Ponoko.

 

 

This is the finished chassis and board mounted. The top of the chassis is designed to be easily removed with the 4 screws in the corners so you can get easy access to the header. If your going to do a lot of tinkering, just cut a hole for your FTDI cable.

 

The back of the Chassis

 

 

And the Bottom. I left the breakout board RJ45 jack with a snap out cover in the chassis design just incase you don’t use it.

 

Downloads:

Chassis:

Corel Draw Format

AI Format

DXF Format

Circuit Board:

MicroMonitor.brd

MicroMonitor.sch

Code Example:

Arduino.pde