# How do I properly transmit PWM data over Xbee 802.15.4 S1 **URL:** \ **Category:** XBee - 802.15.4\ **Tags:** pwm, line-passing, series1, xbee\ **Created:** [May 15, 2017, 2:51pm UTC](https://forums.digi.com/t/how-do-i-properly-transmit-pwm-data-over-xbee-802-15-4-s1/18354 "2017-05-15T14:51:35Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![AlbertIsland](https://avatars.discourse-cdn.com/v4/letter/a/e19adc/32.png) [@AlbertIsland](https://forums.digi.com/u/AlbertIsland)\ **Post date:** [May 15, 2017, 2:51pm UTC](https://forums.digi.com/t/how-do-i-properly-transmit-pwm-data-over-xbee-802-15-4-s1/18354/1 "2017-05-15T14:51:35Z")
I’m having trouble properly driving a lilypad vibe board using PWM over Xbees. The signal is successfully received by the Base Xbee, however, it produces an erratic drive pattern on the Vibe Board. In this project I am attempting to detect a user’s heartbeat and transmit the heartbeat to another user where each beat is felt as a pulse from a vibe motor. The pulse from the vibe motor should be a consistent vibration 300ms in length each time a heartbeat is detected. Instead it’s choppy and not in time with the user’s heartbeat. I have tested the signal by removing PWM from the code (replaced with DigitalWrite), driving an LED over digital line passing and it is working correctly. I believe it is a sample rate issue. Device #1 detects a user’s heartbeat, converts it to PWM and transmits it over Xbee (connected to Lilypad Xbee). Device #2 receives the signal from device #1 and drives a vibe motor connected directly to Lilypad Xbee pin. 2 Xbee 802.15.4 S1 in line passing mode with the Remote DIO1 set to ADC and Base PWM1 set to PWM Out. Notable Xbee configuration points are: Remote D1= 2 IC = 2 IT = 1 IR = 5 Base P1 = 2 IU = 1 Help would be greatly appreciated. -John ---
**Author:** ![mvut](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.digi.com/mvut/32/31_2.png) [@mvut](https://forums.digi.com/u/mvut)\ **Post date:** [May 15, 2017, 3:54pm UTC](https://forums.digi.com/t/how-do-i-properly-transmit-pwm-data-over-xbee-802-15-4-s1/18354/2 "2017-05-15T15:54:22Z")
Don’t use both a Sample rate and change detect. Just use the sample rate (IR).