# Monitor One and ads1115 **URL:** \ **Category:** Hardware\ **Created:** [June 10, 2024, 10:10pm UTC](https://community.particle.io/t/monitor-one-and-ads1115/67001 "2024-06-10T22:10:54Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![beard007](https://avatars.discourse-cdn.com/v4/letter/b/ad7895/32.png) [@beard007](https://community.particle.io/u/beard007)\ **Post date:** [June 10, 2024, 10:10pm UTC](https://community.particle.io/t/monitor-one-and-ads1115/67001/1 "2024-06-10T22:10:54Z")
Designing a custom board for Monitor One. Have to use both an external ADC and preserve the Rs-485 interface. Can I put ads1115 on the Wire (I2C interface associated with A0 and A1 pins) which is already used to communicate with the temp sensor and the led driver? I do not see any reason why not after looking at the applicable datasheets, but wanted to check anyway. Thanks! ---
**Author:** ![rickkas7](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/rickkas7/32/8681_2.png) [@rickkas7](https://community.particle.io/u/rickkas7)\ **Post date:** [June 11, 2024, 7:27am UTC](https://community.particle.io/t/monitor-one-and-ads1115/67001/2 "2024-06-11T07:27:07Z")
On the Monitor One you can use Wire on A0/A1 and use the UART serial on RX/TX for RS485 at the same time. This would allow you to connect the ADS1115 via I2C. This is a recommended configuration and should work well. This cannot be one on the Tracker One M8 connector, since I2C (Wire3) and UART RX/TX share the same pins. ---
**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/particle/original/3X/6/4/64635adccc35238caa19e9b553ec3e98b163d026.png) [@system](https://community.particle.io/u/system)\ **Post date:** [December 10, 2024, 7:27pm UTC](https://community.particle.io/t/monitor-one-and-ads1115/67001/3 "2024-12-10T19:27:38Z")
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