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John S
Reviewed in the United States on October 25, 2024
Good product, just be careful about the connections. See other buyer's connection information first and don't trust the information listed on the Amazon site for this product. If you connect the white wire directly to Vcc (white is actually A or B, not Vcc), as instructed in the product description, you may break the open-collector output. It did not come with any other instructions and the connection information on the device is only in Chinese.
Steve DeGroof
Reviewed in the United States on July 26, 2022
I bought this after a disappointing experience with an off-the-shelf arcade spinner module. Figured it'd be less trouble to build one myself. Hooked it up to an Arduino, pieced together some code, added buttons and a case, and it was ready to go. All told, the encoder plus the Arduino cost less than half of what the defective spinner rig was going for. And it seems like a much more solid piece of hardware. Excellent bearings, from what I can tell. Just need to build a spinner knob with some weights embedded in it to give it a bit more rotational inertia.
Frederick Germain
Reviewed in Canada on June 5, 2020
I first relied on the indications on the amazon page, which said that:White wire = VCCBlack wire = NegativeRed wire = Phase AGreen wire = Phase BOnly problem though is that I first wired up and uploaded the code, when I started turning the knob, nothing happened. I first thought the encoder was busted or anything, but then I went on Google to look up what were the colors symbols in mandarin, and in the end, I inverted Red and White. However, after testing it, properly wired, it worked like it should (Serial monitor displaying consistent incrementing/decrementing based on turning direction and stable readings). However, I suppose that, if you were using something like 24 V, you could have easily fried some components inside.So, make sure you look up the color symbols and figure them out as a double check.Other than the labelling, as I said earlier, it works like it should (no erratic behavior like some other encoders seem to have in reviews) and the materials seem to be of more than very acceptable quality. No bouncing like mechanical encoders (because it's optical). It doesn't have a "Z" phase (1 pulse per turn), but for most applications, 2 phases might be all that you need.Honestly, this encoder is a good enough deal.
Brackish Water
Reviewed in the United States on June 28, 2020
I bought these in late 2019 for $16.99 a piece. They are accurate and so far have been very reliable, so I came back to order 2-more but now at $26.05 will have to order from another Vendor here.I like to support Vendors of good things and can live with a little upwards price movement over time, but that price-hike is too much for my loyalty this time.
Bobby Towe Sr
Reviewed in the United States on July 13, 2017
I can't give a review at this time, as I am still in process of collecting parts for my project, it may be several months before they actually get put to use.
Out West
Reviewed in the United States on January 23, 2017
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Dave
Reviewed in the United States on September 1, 2016
Seems to work well. The shaft is very smooth and low-friction. There are several questions about the correct wiring diagram, and the answers seem inconsistent, so I created and have attached a color key obtained using Google Translate -- match these to your unit for correct wiring. I've removed one star for poor documentation.I found that by using the INPUT_PULLUP mode on a standard Arduino UNO board, I did not need any external pullup resistors. And the unit ran happily using just the USB-provided 5V supply. Another reviewer (Kevin Blasko) of a similar item posted some sample code. I modified it slightly for my unit and repost it here:// Wiring connections for my encoder:// Red : VCC = 5V// Black: 0V = GND// White: OUTA = Digital pin 2// Green: OUTB = Digital pin 3// With these OUTA/OUTB connections and the interrupt code below,// clockwise rotation gives positive encoder counts.const int outA = 2;const int outB = 3;volatile long encoder = 0; // declare volatile since modified by interrupt routineslong encoder_save = 0;void setup() { // set encoder pins pinMode(outA, INPUT_PULLUP); pinMode(outB, INPUT_PULLUP); // attach interrupts to pins // call digitalPinToInterrupt(pin) to be compatible with different Arduino boards attachInterrupt(digitalPinToInterrupt(outA), outAChange, CHANGE); attachInterrupt(digitalPinToInterrupt(outB), outBChange, CHANGE); // initialize serial Serial.begin(9600); Serial.println(""); Serial.println("Rotary encoder test.");}void loop() { if (encoder_save != encoder) { // only print if new value encoder_save = encoder; Serial.println(encoder); } delay(100);}// interrupt routinesvoid outAChange() { // when outA changes, outA==outB means negative direction encoder += digitalRead(outA) == digitalRead(outB) ? -1 : 1;}void outBChange() { // when outB changes, outA==outB means positive direction encoder += digitalRead(outA) == digitalRead(outB) ? 1 : -1;}
Kristin M. Clemons
Reviewed in the United States on December 10, 2016
FRC team 1080, Resurgence robotics here. This sensor worked Great with RoboRio, Arduino, and (modern robotics FTC controllers). This sensor pulls the two signal wires down to ground to "pulse" or create a signal, when each line is triggered a pulse is read ona digital input pin, these ppulses are then counted, and whichever is pulsing first will generally determine direction. Micro controllers such as the arduino have a weak pull up resistor inside of them pulling the signal pin high for a logical 0, and when the transistor completes a connection to ground it pulls down on the signal voltage and a trigger voltage is reached. in the case of this sensor, it has a very low leakage current, meaning if using a "weak pullup" (5v at 15k-ohms) some arduino (3.3v at 40k-ohms) RoboRio, you wont notice much change or voltage drop when both lines are logical 0 as there is almost no leakage current from either transistor in off state, when pulled down, as much current as the roborio pin can supply is used resulting in a very near 0.0v. Be aware That, this encoder, when set to count rising and falling edges of all pulses, can output 2400 cpr.enc = new Encoder(4,5, true, Encoder::EncodingType::k4X); k1x= 600cpr, k2x= 1200cpr, k4x=2400cpr. if run at high speed this encoder when quadrature decoding (k4x) will tax any CPU.
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