{"id":686,"date":"2017-10-11T13:00:27","date_gmt":"2017-10-11T12:00:27","guid":{"rendered":"http:\/\/chewett.co.uk\/blog\/?p=686"},"modified":"2017-10-09T23:12:15","modified_gmt":"2017-10-09T22:12:15","slug":"mini-red-led-digital-voltmeter-3-3-30v-review","status":"publish","type":"post","link":"https:\/\/chewett.co.uk\/blog\/686\/mini-red-led-digital-voltmeter-3-3-30v-review\/","title":{"rendered":"Mini Red LED Digital Voltmeter 3.3-30V Review"},"content":{"rendered":"

This post reviews the mini red LED digital voltmeter. Here I review and test the voltmeter in a number of circumstances to see how well it works.<\/p>\n

<\/p>\n

What can the voltmeter be used for<\/h2>\n

\"\"<\/a>This voltmeter is a simple LCD display showing the current voltage. This is to be\u00a0used with a low to medium voltage circuit, rated at between 3.3 and 30 volts.<\/p>\n

The voltage range makes it perfect to keep track of the voltage used by small\u00a0circuits such as Arduino or Raspberry Pi electronics which typically operate on 5 volts\u00a0supply.<\/p>\n

One use of this is monitor the voltage in a battery. When using certain Lithium Polymer (LiPo) batteries it is important to ensure their voltage does not fall below the minimum voltage.<\/p>\n

To measure the current voltage of any component you place this in parallel\u00a0to it. Therefore to measure the voltage of a battery you connect the voltmeter to the positive and negative terminals of a battery.<\/p>\n

Using this you can keep an eye on the current voltage of your battery to ensure you do not discharge it past the recommended levels.<\/p>\n

Wiring it up to an Arduino<\/h2>\n

\"\"<\/a><\/p>\n

Originally this item came with a stranded wire on the end.\u00a0This works well for permanent circuits soldered to a PCB but didn’t work well\u00a0with my prototyping breadboard. I improved its usability with a breadboard by soldering\u00a0some breadboard pins to the end and wrapping it in heatshrink. Here I used a\u00a0small burner to heat up the heat shrink to insulate the wire.<\/p>\n

Once this was accomplished I was able to use it on a breadboard much more easily.\u00a0The breadboard pins work a lot better to push it into the breadboard.<\/p>\n

Using this I was able to measure the voltage across a number of components while working with the breadboard and Arduino.<\/p>\n

The advantage of using this is that you can permanently monitor the voltage of a circuit. The LCD display works well both under light or in the dark as it is relatively bright.<\/p>\n

Final Review<\/h2>\n

With the ease of being able to attach the device to both a breadboard and PCB this digital display works well for low voltage circuits. I would definitely\u00a0recommend this sensor to add to any project requiring a display of the voltage of a battery or component.<\/p>\n","protected":false},"excerpt":{"rendered":"

This post reviews the mini red LED digital voltmeter. Here I review and test the voltmeter in a number of circumstances to see how well it works.<\/p>\n","protected":false},"author":1,"featured_media":707,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[97],"tags":[132,178],"class_list":["post-686","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electronics","tag-arduino","tag-voltmeter"],"wppr_data":{"cwp_meta_box_check":"No"},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2017\/10\/voltmeter-post-icon.jpg?fit=800%2C800&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p2toWX-b4","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":971,"url":"https:\/\/chewett.co.uk\/blog\/971\/review-youtumall-usb-multimeter\/","url_meta":{"origin":686,"position":0},"title":"Review of the\u00a0Youtumall USB Multimeter","author":"Chewett","date":"January 10, 2018","format":false,"excerpt":"This post reviews the\u00a0Youtumall USB Multimeter. This can be used for measure the voltage\/current used by a USB peripheral. The\u00a0Youtumall USB Multimeter This small USB device acts as a small two port USB hub. However one of the key features of it is that it has a digital display that\u2026","rel":"","context":"In "Electronics"","block_context":{"text":"Electronics","link":"https:\/\/chewett.co.uk\/blog\/category\/electronics\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/01\/usb_multimeter_post_icon.jpg?fit=800%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/01\/usb_multimeter_post_icon.jpg?fit=800%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/01\/usb_multimeter_post_icon.jpg?fit=800%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/01\/usb_multimeter_post_icon.jpg?fit=800%2C800&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":1856,"url":"https:\/\/chewett.co.uk\/blog\/1856\/using-the-sw-18010p-motion-vibration-sensor-with-a-wemos-d1-mini-esp8266\/","url_meta":{"origin":686,"position":1},"title":"Using the SW-18010P Motion Vibration Sensor with a WeMos D1 Mini (ESP8266)","author":"Chewett","date":"February 2, 2019","format":false,"excerpt":"In this blog post I talk about how you can use a SW-18010P Motion Vibration sensor with a WeMos D1 Mini (ESP8266) using the Arduino IDE. Summary of the SW-18010P Motion Vibration sensor This motion sensor works by encasing a small spring inside a metal casing. Whenever the sensor moves\u2026","rel":"","context":"In "Electronics"","block_context":{"text":"Electronics","link":"https:\/\/chewett.co.uk\/blog\/category\/electronics\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2019\/02\/sw18010p_vibration_sensor_wemos.jpg?fit=800%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2019\/02\/sw18010p_vibration_sensor_wemos.jpg?fit=800%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2019\/02\/sw18010p_vibration_sensor_wemos.jpg?fit=800%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2019\/02\/sw18010p_vibration_sensor_wemos.jpg?fit=800%2C800&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":1879,"url":"https:\/\/chewett.co.uk\/blog\/1879\/using-the-ttp223b-capacitive-touch-sensor-with-a-wemos-d1-mini-esp8266\/","url_meta":{"origin":686,"position":2},"title":"Using the TTP223B Capacitive Touch Sensor with a WeMos D1 Mini (ESP8266)","author":"Chewett","date":"January 5, 2019","format":false,"excerpt":"In this blog post I talk about how you can use the TTP223B Capacitive Touch sensor with a WeMos D1 Mini (ESP8266) using the Arduino IDE. Summary of the TTP223B Capacitive Touch Sensor The TTP223B capacitive touch sensor works as a standard button. The main difference being that it requires\u2026","rel":"","context":"In "Electronics"","block_context":{"text":"Electronics","link":"https:\/\/chewett.co.uk\/blog\/category\/electronics\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2019\/01\/ttp223b_capacitive_sensor_wemos.jpg?fit=800%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2019\/01\/ttp223b_capacitive_sensor_wemos.jpg?fit=800%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2019\/01\/ttp223b_capacitive_sensor_wemos.jpg?fit=800%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2019\/01\/ttp223b_capacitive_sensor_wemos.jpg?fit=800%2C800&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":1849,"url":"https:\/\/chewett.co.uk\/blog\/1849\/using-the-sw-420-motion-vibration-sensor-with-a-wemos-d1-mini-esp8266\/","url_meta":{"origin":686,"position":3},"title":"Using the SW-420 Motion Vibration Sensor with a WeMos D1 Mini (ESP8266)","author":"Chewett","date":"December 22, 2018","format":false,"excerpt":"In this blog post I talk about how you can use a SW-420 Motion Vibration sensor with a WeMos D1 Mini (ESP8266) using the Arduino IDE. Summary of the SW-420 Motion Vibration Sensor This sensor mounts a motion detection component with a small micro-controller and a potentiometer. This has a\u2026","rel":"","context":"In "Electronics"","block_context":{"text":"Electronics","link":"https:\/\/chewett.co.uk\/blog\/category\/electronics\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/12\/sw420_vibration_sensor_wemos.jpg?fit=800%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/12\/sw420_vibration_sensor_wemos.jpg?fit=800%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/12\/sw420_vibration_sensor_wemos.jpg?fit=800%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/12\/sw420_vibration_sensor_wemos.jpg?fit=800%2C800&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":1741,"url":"https:\/\/chewett.co.uk\/blog\/1741\/mintice-red-cover-rocker-toggle-switch-spst-for-arduino-review-and-code\/","url_meta":{"origin":686,"position":4},"title":"Mintice Red Cover Rocker Toggle Switch SPST For Arduino Review and Code","author":"Chewett","date":"November 24, 2018","format":false,"excerpt":"This post talks about using the\u00a0Mintice Red Cover Rocker Toggle Switch SPST with the Arduino. Mintice Red Cover Rocker Toggle Switch SPST The Mintice Red Cover Rocker toggle switch is a standard SPST switch. Before being able to toggle the switch the red rocker cover must be lifted up and\u2026","rel":"","context":"In "Electronics"","block_context":{"text":"Electronics","link":"https:\/\/chewett.co.uk\/blog\/category\/electronics\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/11\/mintice_post_icon.jpg?fit=800%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/11\/mintice_post_icon.jpg?fit=800%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/11\/mintice_post_icon.jpg?fit=800%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2018\/11\/mintice_post_icon.jpg?fit=800%2C800&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":2054,"url":"https:\/\/chewett.co.uk\/blog\/2054\/mq-135-air-quality-and-hazardous-gas-sensor-for-arduino-review-and-code\/","url_meta":{"origin":686,"position":5},"title":"MQ-135 Air Quality and Hazardous Gas Sensor For Arduino Review and Code","author":"Chewett","date":"April 13, 2019","format":false,"excerpt":"This post talks about using the MQ-135 Air Quality and Hazardous Gas sensor with an Arduino. MQ-135 Air Quality and Hazardous Gas Sensor The MQ-135 air quality and hazadous gas sensor is a small unit that reports the relative quality of the air. This specific variant works particularly well with\u2026","rel":"","context":"In "Electronics"","block_context":{"text":"Electronics","link":"https:\/\/chewett.co.uk\/blog\/category\/electronics\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2019\/03\/MQ-135-Sensor-Air-Quality-Sensor-Hazardous-Gas-Detection-Module-for-Arduino_posticon.jpg?fit=800%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2019\/03\/MQ-135-Sensor-Air-Quality-Sensor-Hazardous-Gas-Detection-Module-for-Arduino_posticon.jpg?fit=800%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2019\/03\/MQ-135-Sensor-Air-Quality-Sensor-Hazardous-Gas-Detection-Module-for-Arduino_posticon.jpg?fit=800%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/chewett.co.uk\/blog\/wp-content\/uploads\/2019\/03\/MQ-135-Sensor-Air-Quality-Sensor-Hazardous-Gas-Detection-Module-for-Arduino_posticon.jpg?fit=800%2C800&ssl=1&resize=700%2C400 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/chewett.co.uk\/blog\/wp-json\/wp\/v2\/posts\/686","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chewett.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chewett.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chewett.co.uk\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/chewett.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=686"}],"version-history":[{"count":5,"href":"https:\/\/chewett.co.uk\/blog\/wp-json\/wp\/v2\/posts\/686\/revisions"}],"predecessor-version":[{"id":713,"href":"https:\/\/chewett.co.uk\/blog\/wp-json\/wp\/v2\/posts\/686\/revisions\/713"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/chewett.co.uk\/blog\/wp-json\/wp\/v2\/media\/707"}],"wp:attachment":[{"href":"https:\/\/chewett.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=686"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chewett.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=686"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chewett.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=686"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}