hit with stick

README.md

@@ -2,4 +2,6 @@
 
 ## Some simple and fun robotics projects 
 
-[pong-catapult.md](lego-ev3/pong-catapult/pong-catapult.md)
+[pong-catapult.md](lego-ev3/pong-catapult/pong-catapult.md)
+
+[hit-with-stick.md](arduino/hit-with-stick/hit-with-stick.md)

arduino/hit-with-stick/hit-with-stick-photos.md

@@ -0,0 +1,17 @@
+
+
+![hit-with-stick-1.png](hit-with-stick-1.png)
+
+![hit-with-stick-2.png](hit-with-stick-2.png)
+
+![hit-with-stick-3.png](hit-with-stick-3.png)
+
+![hit-with-stick-4.png](hit-with-stick-4.png)
+
+![hit-with-stick-5.png](hit-with-stick-5.png)
+
+![hit-with-stick-6.png](hit-with-stick-6.png)
+
+Video: 
+
+https://www.youtube.com/watch?v=RTrSjhRTgA0

arduino/hit-with-stick/hit-with-stick.md

@@ -0,0 +1,79 @@
+
+
+# hit with stick robot  
+
+Can I build an interesting robot below 10€, that could be a prototype for robotics competition?
+
+Robot will scan for targets in 180 degrees arc, and will try to hit targets that are not too close or too far.
+
+Lot of room for improvements, but good enough for proof of concept.
+
+Photos and video: [hit-with-stick-photos.md](hit-with-stick-photos.md)
+
+
+## Required components
+
+- nodemcu/arduino
+- breadboard
+- 2x servo (SG90)
+- Ultrasonic Distance Sensor (HC-SR04)
+- 3x 1kOhm resistors
+- ~20 wires
+- couple of sticks for arms
+- some way to attach everything together
+
+Total cost ~15€ .
+
+## Steps
+
+1. Get components.
+2. Download arduino IDE.
+3. Connect and test a simple program with blinking light.
+4. Assemble components according to the diagram below.
+5. Connect to the computer and upload program.
+    1. https://git.makerobots.eu/konstantin/arduino-robots/src/branch/main/src/2026-06-18_hit-with-stick/2026-06-18_hit-with-stick.ino .
+6. Iterate and find distances and delays that work for your setup.
+    1. Min 10cm, max 20cm for detection.
+    2. Offset if hitting stick is not centered.
+    3. How fast could you make it without missing targets or hitting ones that are too close?
+
+
+
+## wiring diagram
+
+```
+    5V Power Bank
+    +         -
+    |         |
+    |         +-------------------- GND ------------------+
+    |                                                    |
+    |                                                    |
+    +----+-------------------+----------------+           |
+         |                   |                |           |
+      Servo 1             Servo 2         NodeMCU VIN     |
+      Red wire            Red wire            (5V in)     |
+         |                   |                |           |
+         |                   |                |           |
+     Signal D5          Signal D6            GND ---------+
+                                         
+    HC-SR04
+    VCC ---------------------- 5V
+    GND ---------------------- GND
+    TRIG --------------------- D1
+    ECHO -- voltage divider -- D2
+    
+HC-SR04 Echo
+      |
+     1kΩ
+      |
+      +----> NodeMCU D2
+      |
+     2kΩ
+      |
+     GND    
+```
+
+
+
+
+