# Set up sample rate of arduino **URL:** \ **Category:** Programming\ **Created:** [August 14, 2021, 2:32am UTC](https://forum.arduino.cc/t/set-up-sample-rate-of-arduino/895460 "2021-08-14T02:32:21Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![webergaia](https://avatars.discourse-cdn.com/v4/letter/w/ba8739/32.png) [@webergaia](https://forum.arduino.cc/u/webergaia)\ **Post date:** [August 14, 2021, 2:32am UTC](https://forum.arduino.cc/t/set-up-sample-rate-of-arduino/895460/1 "2021-08-14T02:32:21Z")
Hello Everyone! I have been inputing a sine wave in arduino and I'll make the analog-digital conversion. How can I set up the sample rate to 9600 samples or more? I know that I will change the clock frequency but I don't know how to do that. Initially, I have 4400 samples per seconds, but I want 9600 samples. // Variáveis Globais float analogIN = 0.00; unsigned long tempo = 0; void setup() { // put your setup code here, to run once: Serial.begin(9600); pinMode(A0, INPUT); ADCSRA &= ~(bit (ADPS0) | bit (ADPS1) | bit (ADPS2)); // clear prescaler bits ADCSRA |= bit (ADPS0) | bit (ADPS1) | bit (ADPS2); // 128 - Prescaler //analogReference(EXTERNAL); } void loop() { // put your main code here, to run repeatedly: analogIN = analogRead(A0); ADC = (analogIN\*5.0)/1023; Serial.println(ADC); [//Serial.print](https://Serial.print)(",145,680"); [//Serial.println](https://Serial.println)(); tempo = millis(); } Best Regards ---
**Author:** ![J-M-L](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/j-m-l/32/766245_2.png) [@J-M-L](https://forum.arduino.cc/u/J-M-L)\ **Post date:** [August 14, 2021, 2:53am UTC](https://forum.arduino.cc/t/set-up-sample-rate-of-arduino/895460/2 "2021-08-14T02:53:22Z")
Hello, do yourself a favour and please read [How to get the best out of this forum](https://forum.arduino.cc/t/how-to-get-the-best-out-of-this-forum/679966) and modify your post accordingly (including code tags and necessary documentation of your ask). * * * As the [analogRead() - Arduino Reference](https://www.arduino.cc/reference/en/language/functions/analog-io/analogread/) documentation states > On ATmega based boards (UNO, Nano, Mini, Mega), it takes about 100 microseconds (0.0001 s) to read an analog input, so the maximum reading rate is about 10,000 times a second. So if you use analogRead and want 9600 samples per second your board likely won’t have the time to do anything else… ---
**Author:** ![anon73444976](https://avatars.discourse-cdn.com/v4/letter/a/439d5e/32.png) [@anon73444976](https://forum.arduino.cc/u/anon73444976)\ **Post date:** [August 14, 2021, 6:10am UTC](https://forum.arduino.cc/t/set-up-sample-rate-of-arduino/895460/3 "2021-08-14T06:10:37Z")
> [@webergaia](#): > > Serial.begin(9600); Fix that too. ---
**Author:** ![sterretje](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/sterretje/32/391294_2.png) [@sterretje](https://forum.arduino.cc/u/sterretje)\ **Post date:** [August 14, 2021, 6:54am UTC](https://forum.arduino.cc/t/set-up-sample-rate-of-arduino/895460/4 "2021-08-14T06:54:25Z")
@webergaia, your topic has been moved to a more suitable location on the forum. _Installation and Troubleshooting_ is not for problems with (or advice on) your project 😉 See [About the Installation & Troubleshooting category](https://forum.arduino.cc/t/about-the-installation-troubleshooting-category/847458). Please edit your post, select all code and click the \ button to apply code tags and next save your post. It makes it easier to read, easier to copy and prevents the forum software from incorrect interpretation of the code. ---
**Author:** ![lastchancename](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/lastchancename/32/215426_2.png) [@lastchancename](https://forum.arduino.cc/u/lastchancename)\ **Post date:** [August 14, 2021, 7:11am UTC](https://forum.arduino.cc/t/set-up-sample-rate-of-arduino/895460/5 "2021-08-14T07:11:08Z")
**Not reading lazy posts any more.** ---
**Author:** ![PerryBebbington](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/perrybebbington/32/238766_2.png) [@PerryBebbington](https://forum.arduino.cc/u/PerryBebbington)\ **Post date:** [August 14, 2021, 7:47am UTC](https://forum.arduino.cc/t/set-up-sample-rate-of-arduino/895460/6 "2021-08-14T07:47:19Z")
@webergaia I have removed your duplicate topic on the same subject and moved this one to a more appropriate place. Please take some time to read [How to get the best out of this forum](https://forum.arduino.cc/t/how-to-get-the-best-out-of-this-forum/679966) Please go back and post your code as instructed and please only post a question once, taking care to select an appropriate section of the forum. Thanks, ---
**Author:** ![Railroader](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/railroader/32/274550_2.png) [@Railroader](https://forum.arduino.cc/u/Railroader)\ **Post date:** [August 14, 2021, 9:43am UTC](https://forum.arduino.cc/t/set-up-sample-rate-of-arduino/895460/7 "2021-08-14T09:43:43Z")
Drop the floating point, converting to volt. It doesn't add any precision. Print the integer coming from the ADC reading. ---
**Author:** ![johnwasser](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/johnwasser/32/214270_2.png) [@johnwasser](https://forum.arduino.cc/u/johnwasser)\ **Post date:** [August 14, 2021, 2:28pm UTC](https://forum.arduino.cc/t/set-up-sample-rate-of-arduino/895460/8 "2021-08-14T14:28:21Z")
> [@webergaia](#): > > analogIN = analogRead(A0); Don't use analogRead(). Would 9615.38... samples per second be OK? You can get that with a prescale of 128 (125 kHz ADC clock) and selecting 'free running' mode. Every 13 ADC clock cycles (9615.38... Hz) you will get an ADC Complete interrupt. See: ADIE (ADC Complete Interrupt Enable). In the 'ADC Complete' ISR, grab the data from the ADC and shove it in a circular buffer. In loop(), send data from the buffer whenever it is not empty. ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [December 12, 2021, 2:28pm UTC](https://forum.arduino.cc/t/set-up-sample-rate-of-arduino/895460/9 "2021-12-12T14:28:22Z")
Closed on December 12, 2021, 2:28pm UTC This topic was automatically closed 120 days after the last reply. New replies are no longer allowed.