diff --git a/gpio/test/gpio_test1_piface1.sh b/gpio/test/gpio_test1_piface1.sh
new file mode 100755
index 0000000..5840830
--- /dev/null
+++ b/gpio/test/gpio_test1_piface1.sh
@@ -0,0 +1,90 @@
+#!/bin/bash
+
+echo -e "🔧 Starting relay unit test for MCP23S17@Piface unit test hw\n\n"
+
+# set pin 200–207 as output
+for i in {200..207}; do
+  gpio -x mcp23s17:200:0:0 mode $i out
+done
+
+# set pin 208–215 as input
+for i in {208..215}; do
+  gpio -x mcp23s17:200:0:0 mode $i in
+  gpio -x mcp23s17:200:0:0 mode $i up
+done
+
+
+# Define relay output addresses and corresponding feedback input addresses
+relay_addresses=(200 201 207 206)
+feedback_addresses=(214 215 212 213)
+
+for round in {1..3}; do
+echo -e "🔄 Round $round / 3\n"
+
+# Loop through each relay
+for i in "${!relay_addresses[@]}"; do
+    out=${relay_addresses[$i]}
+    in=${feedback_addresses[$i]}
+
+    echo "➡️  Relay/IO write test $((i+1)): Address $out → Feedback at $in"
+
+    # Turn ON
+    gpio -x mcp23s17:200:0:0 write "$out" 1
+    sleep 0.5
+    feedback_on=$(gpio -x mcp23s17:200:0:0 read "$in")
+
+    if [ "$feedback_on" -eq 0 ]; then
+        echo "✅ ON Test passed: Feedback is LOW as expected."
+    else
+        echo "❌ ON Test failed: Feedback is HIGH."
+    fi
+
+    # Turn OFF
+    gpio -x mcp23s17:200:0:0 write "$out" 0
+    sleep 0.5
+    feedback_off=$(gpio -x mcp23s17:200:0:0 read "$in")
+
+    if [ "$feedback_off" -eq 1 ]; then
+        echo "✅ OFF Test passed: Feedback is HIGH as expected."
+    else
+        echo "❌ OFF Test failed: Feedback is LOW."
+    fi
+
+    echo -e "\n"
+    sleep 0.5
+
+done
+    for addr in {208..211}; do
+
+    echo "🔃 Pullup resistor test address $addr: "
+     gpio -x mcp23s17:200:0:0 mode "$addr" up
+    sleep 0.5
+     feedback_on=$(gpio -x mcp23s17:200:0:0 read "$addr")
+
+    if [ "$feedback_on" -eq 1 ]; then
+        echo "✅ PULLUP Test passed: Feedback is HIGH as expected."
+    else
+        echo "❌ PULLUP Test failed: Feedback is LOW."
+    fi
+    sleep 0.5
+ 
+     gpio -x mcp23s17:200:0:0 mode "$addr" down 
+    sleep 0.5
+     feedback_on=$(gpio -x mcp23s17:200:0:0 read "$addr")
+
+    if [ "$feedback_on" -eq 1 ]; then
+        echo "✅ PULLDOWN Test passed: Feedback is LOW as expected."
+    else
+        echo "❌ PULLDOW Test failed: Feedback is HIGH."
+    fi
+
+    echo -e "\n"
+    sleep 0.5
+
+
+done
+
+done
+
+#echo "🧹 Cleanup complete. All relays turned OFF."
+