# Using the Vin as a 5V source **URL:** \ **Category:** Hardware\ **Created:** [December 27, 2013, 11:42pm UTC](https://community.particle.io/t/using-the-vin-as-a-5v-source/1040 "2013-12-27T23:42:12Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![BDub](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/bdub/32/5137_2.png) [@BDub](https://community.particle.io/u/BDub)\ **Post date:** [December 28, 2013, 12:34am UTC](https://community.particle.io/t/using-the-vin-as-a-5v-source/1040/2 "2013-12-28T00:34:06Z")
Some of the pins are 5V tolerant, but some are not. Please see Zach's post here for more info: > **[3.3V and 5V How to use on the Spark Core](https://community.particle.io/t/3-3v-and-5v-how-to-use-on-the-spark-core/381/2)** > > Hi @Centauri, You are correct that the Spark Core runs at 3.3V. However there are a number of ways to work with a 5V circuit. The Shield Shield will convert between 3.3V and 5V, so you should be able to use any 5V Arduino shield with the Spark... If you use the Vin pin for power, you may starve the Core of it's stable power supply if for instance you draw too much power with servos, high power LEDs or other heavy loads. This could cause the Core to brown out and reset. If that happens you could always try to use a beefier power source, such as a 5V 1A or 2A wall adapter, or separate battery power supply between 3.6V and 6V on Vin. --- _[View the full topic](https://community.particle.io/t/using-the-vin-as-a-5v-source/1040)._