# Minimum connection requirements of VL53L1X Time of flight **URL:** \ **Category:** Support\ **Created:** [October 22, 2019, 12:35pm UTC](https://forums.pimoroni.com/t/minimum-connection-requirements-of-vl53l1x-time-of-flight/11989 "2019-10-22T12:35:01Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![dynamite\_dan](https://avatars.discourse-cdn.com/v4/letter/d/b3f665/32.png) [@dynamite\_dan](https://forums.pimoroni.com/u/dynamite_dan)\ **Post date:** [October 22, 2019, 12:35pm UTC](https://forums.pimoroni.com/t/minimum-connection-requirements-of-vl53l1x-time-of-flight/11989/1 "2019-10-22T12:35:01Z")
Hi there I want to use this with my Pi but I don’t have pin 7 (GPIO4) available, at least not without considerable effort! It’s labelled INT on the VL53L1X board. I was under the impression that this module is I2C only and thus only needs two signal lines. My questions are: What does the INT pin actually do? If it’s important, can I use another GPIO pin instead? Thanks ---
**Author:** ![romilly](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/romilly/32/218_2.png) [@romilly](https://forums.pimoroni.com/u/romilly)\ **Post date:** [January 13, 2020, 1:52pm UTC](https://forums.pimoroni.com/t/minimum-connection-requirements-of-vl53l1x-time-of-flight/11989/2 "2020-01-13T13:52:32Z")
The board works fine without the INT pin connected. The INT pin can be used to signal that a pre-defined condition is met, but if all you want to do is read the distance then you only need to connect the SDA and SCL signal lines and Vcc + GND for power ---
**Author:** ![dynamite\_dan](https://avatars.discourse-cdn.com/v4/letter/d/b3f665/32.png) [@dynamite\_dan](https://forums.pimoroni.com/u/dynamite_dan)\ **Post date:** [January 13, 2020, 5:53pm UTC](https://forums.pimoroni.com/t/minimum-connection-requirements-of-vl53l1x-time-of-flight/11989/3 "2020-01-13T17:53:46Z")
@romilly Thanks for the confirmation. I thought that would be the case but couldn’t find any documentation that could tell me more! I don’t suppose you’d know why my sensor seems a little slow? It takes around 1 second to give me a distance reading. ---
**Author:** ![romilly](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/romilly/32/218_2.png) [@romilly](https://forums.pimoroni.com/u/romilly)\ **Post date:** [January 14, 2020, 3:58pm UTC](https://forums.pimoroni.com/t/minimum-connection-requirements-of-vl53l1x-time-of-flight/11989/4 "2020-01-14T15:58:11Z")
Is that 1 second for the first read or for every read? ---
**Author:** ![dynamite\_dan](https://avatars.discourse-cdn.com/v4/letter/d/b3f665/32.png) [@dynamite\_dan](https://forums.pimoroni.com/u/dynamite_dan)\ **Post date:** [January 14, 2020, 4:14pm UTC](https://forums.pimoroni.com/t/minimum-connection-requirements-of-vl53l1x-time-of-flight/11989/5 "2020-01-14T16:14:29Z")
It’s for every read. Since it is occasionally inaccurate I read the value twice and consider it good if the value is within 15mm (enough for my purposes). This dual read takes 2 seconds. I’ve tried leaving the sensor on all the time thinking that it was the startup delay that was causing the problem, but alas no… The only thing I wondered was whether the proximity to a perpendicular surface has a negative effect on the reading speed. The sensor is about 50mm above a table and is measuring the distance horizontally between 50 and 750mm. ---
**Author:** ![romilly](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/romilly/32/218_2.png) [@romilly](https://forums.pimoroni.com/u/romilly)\ **Post date:** [January 14, 2020, 5:29pm UTC](https://forums.pimoroni.com/t/minimum-connection-requirements-of-vl53l1x-time-of-flight/11989/6 "2020-01-14T17:29:06Z")
I’ll have a play tomorrow. ISTR there are timing values on the chip which can be changed, but it’s a long while since I read the datasheet.