diff --git a/docs/README_coach.md b/docs/README_coach.md
index c50be58..a33c23d 100644
--- a/docs/README_coach.md
+++ b/docs/README_coach.md
@@ -367,6 +367,20 @@ data; however, this method easily introduces noise due to friction during motion
   [RBN info](http://www.biorow.com/RBN_en_2015_files/2015RowBiomNews02.pdf)
 * [3D Pin Force sensor (Instrumented C-bracket)](https://biorow.com/products/biorow_sensors/c_bracket) £1,500
 
+#### DIY IMU
+
+##### ORM on a raspberry pi
+
+##### Holyiot nRF52840 USB Dongle
+
+##### Beacon for handle, seat and trunk
+
+* 3x [holyiot 21014]() nRF52810 + lis2dh12 + RGB LED + button
+* [holyiot 21014 zephyr project](https://github.com/danielstuart14/wlen_project/tree/master/beacon/boards/arm/holyiot_21014)
+
+##### 3-axis load cell for foot spreader
+
+
 ### Video
 
 2D pose analysis using [OpenPose](https://github.com/CMU-Perceptual-Computing-Lab/openpose)