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‎README.md

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Tacho
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=====
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This will display the RPM count on 4x 7 segment displays as well as print RPM to
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serial port at 250 ms intervals.
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# Wiring it up
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The input pin needs to be a digital input on which an interrupt can be attached.
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Please see http://arduino.cc/en/Reference/attachInterrupt for details on which
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pins can have interrupts attached. For many of the clone Arduino boards, you
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will need to figure out which board you have. The 'Due' might be a good starting
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point.
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The input will need to either pulse HIGH or pulse LOW. Change RISING / FALLING
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in attachInterrupt() in the setup to suit. Alternatively, a NOT gate can be
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added. Voltage will need to be 0V and 5V to trigger rising and falling edges.
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## Possible inputs
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* Hall effect sensors
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* IR LEDs and IR LDRs
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* Frequency generators (though this is limited to ~166Hz as that is about
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9999 BPM).
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## Other configuration items
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Greater accuracy can be achieved through increasing the number of sensor
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triggers, for example, three magnets evenly spaced on a shaft you are measuring
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and set the MULTIPLIER macro to 3.
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# Known issues
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* WONTFIX: Approximately every 50 days the milliseconds timer will rollover
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causing one erroneous measurement. This is a limitation of how Arduino handles
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the millisecond counter internally, and is unlikely to affect most users.
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* WONTFIX: Clock drift on the Arduino will affect overall accuracy. The amount
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will vary depending on reference clock used and the environment the counter is
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placed in.
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# Libraries
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The tachometer project uses (and includes) the SevSeg library available from:
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https://github.com/DeanIsMe/SevSeg

‎SevSeg.LICENSE.txt

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Apache License
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‎SevSeg.README.md

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SevSeg
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======
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Copyright 2014 Dean Reading
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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* * *
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This library turns your Arduino into a seven segment display controller! Use it to easily display numbers on your seven segment display without any additional controllers.
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It supports common cathode and common anode displays, and the use of switching transistors. Displays with any number of digits can be used, and decimal places are supported.
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[Download it from GitHub][1].
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Direct any questions or suggestions to [email protected]. If I have the time, I'm happy to help you get things working.
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#### Previous Versions Note
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This version is not compatible with previous versions of the SevSeg library, which have been available since 2012. You can download the [old version][2] for compatibility with previously written programs. .
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Thanks to Mark Chambers and Nathan Seidle for code used in updates.
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* * *
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### HARDWARE
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#### Seven Segment Display Pins
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Your display should have:
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**Digit Pins** \- One for each digit. These are the 'common pins'. They will be cathodes (negative pins) for common cathode displays, or anodes (positive pins) for common anode displays.
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**8 Segment Pins** \- One for each of the seven segments plus the decimal point.
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#### Arduino Connections
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All digit pins and segment pins can be connected to any of the Arduino's digital or analog pins; just make sure you take note of your connections!
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#### Current-limiting Resistors
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Don't forget that the display uses LEDs, so you should use current-limiting resistors in series with the *digit pins*. 330 ohms is a safe value if you're unsure. If you use current-limiting resistors on the *segment pins* instead, then open up the SevSeg.h file and set RESISTORS_ON_SEGMENTS to 1 for optimal brightness.
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#### Hardware Configuration
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You have to specify your hardware configuration to the library. The options are detailed below.
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##### Simple, Low Power Displays
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These displays are powered directly through the Arduino output pins.
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**COMMON_CATHODE** \- For common cathode displays without switches. These displays require a low voltage at the digit pin to illuminate the digit.
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**COMMON_ANODE** \- For common anode displays without switches. These displays require a high voltage at the digit pin to illuminate the digit.
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##### Displays with Switches
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Some displays (mostly bigger ones) use switching transistors, but most people won't have to worry about the configurations below.
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**N_TRANSISTORS** \- If you use N-type transistors to sink current (or any other active-high, low-side switches).
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**P_TRANSISTORS** \- If you use P-type transistors to supply current (or any other active-low, high-side switches).
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**NP_COMMMON_CATHODE** \- If your setup uses N-type AND P-type transistors with a common cathode display.
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**NP_COMMMON_ANODE** \- If your setup uses N-type AND P-type transistors with a common anode display.
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Note that use of active-high, high-side switches will have no impact on the configuration chosen. There are usually called high-side switches.
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#### Example Display
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I have a cheap, 4-digit, common anode display from eBay, and the pins of the display are in the following order when viewed from the front:
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**Top Row**
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1,a,f,2,3,b
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**Bottom Row**
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e,d,dp,c,g,4
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Where the digit pins are 1-4 and the segment pins are a-g + dp
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* * *
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### SOFTWARE
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To install, copy the SevSeg folder into your arduino sketchbook\-libraries folder. More detailed instructions are [here][3].
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#### Setting Up
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#include "SevSeg.h"
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SevSeg sevseg; //Instantiate a seven segment object
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void setup() {
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byte numDigits = 4;
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byte digitPins[] = {2, 3, 4, 5};
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byte segmentPins[] = {6, 7, 8, 9, 10, 11, 12, 13};
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sevseg.begin(COMMON_ANODE, numDigits, digitPins, segmentPins);
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...
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digitPins is an array that stores the arduino pin numbers that the digits are connected to. Order them from left to right.
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digitPins is an array that stores the arduino pin numbers that the segments are connected to. Order them from segment a to g , then the decimal place.
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If you wish to use more than 8 digits, increase MAXNUMDIGITS in SevSeg.h.
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#### Setting the Number
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sevseg.setNumber(3141,3); // Displays '3.141'
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The first argument is the number to display. The second argument indicates where the decimal place should be, counted from the least significant digit. E.g. to display an integer, the second argument is 0.
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Floats are supported. In this case, the second argument indicated how many decimal places of precision you want to display. E.g:
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sevseg.setNumber(3.141f,3); //Displays '3.141'
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Out of range numbers show up as ------.
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#### Displaying the Number
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sevseg.refreshDisplay();
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Your program must run the refreshDisplay() function repeatedly to display the number.
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#### Set the Brightness
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sevseg.setBrightness(90);
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The brightness can be adjusted using a value between 0 and 100.
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Note that a 0 does not correspond to no brightness. If you wish for the display to be any dimmer than 0, run `sevseg.refreshDisplay();` less frequently.
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[1]: https://github.com/DeanIsMe/SevSeg
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[2]: https://docs.google.com/file/d/0Bwrp4uluZCpNdE9oWTY0M3BncTA/edit?usp=sharing
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[3]: http://arduino.cc/en/Guide/Libraries
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