Create app.py

app.py

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+import gradio as gr
+
+q = 0
+q_bar = 1
+history = []
+
+
+def sr_latch(s, r):
+    global q, q_bar, history
+
+    s = int(s)
+    r = int(r)
+
+    if s == 1 and r == 1:
+        state = "INVALID"
+    elif s == 1 and r == 0:
+        q, q_bar = 1, 0
+        state = "SET"
+    elif s == 0 and r == 1:
+        q, q_bar = 0, 1
+        state = "RESET"
+    else:
+        state = "HOLD"
+
+    q_display = "X" if state == "INVALID" else str(q)
+    q_bar_display = "X" if state == "INVALID" else str(q_bar)
+
+    history.append(f"S={s}, R={r}  =>  Q={q_display}, Q'={q_bar_display}  [{state}]")
+
+    log = "\n".join(history)
+
+    return q_display, q_bar_display, state, log
+
+
+def reset_latch():
+    global q, q_bar, history
+    q = 0
+    q_bar = 1
+    history = []
+    return "0", "1", "HOLD", ""
+
+
+with gr.Blocks(title="SR Latch Simulator") as demo:
+    gr.Markdown("## SR Latch Simulator")
+    gr.Markdown(
+        "Toggle **S** (set) and **R** (reset) inputs to see how the latch responds. "
+        "The latch remembers its previous state when both inputs are 0."
+    )
+
+    with gr.Row():
+        s_input = gr.Radio(choices=["0", "1"], value="0", label="S (Set)")
+        r_input = gr.Radio(choices=["0", "1"], value="0", label="R (Reset)")
+
+    apply_btn = gr.Button("Apply", variant="primary")
+
+    with gr.Row():
+        q_output = gr.Textbox(label="Q", value="0", interactive=False)
+        q_bar_output = gr.Textbox(label="Q'", value="1", interactive=False)
+        state_output = gr.Textbox(label="State", value="HOLD", interactive=False)
+
+    gr.Markdown("### Truth table")
+    gr.Dataframe(
+        value=[
+            ["0", "0", "Prev", "Prev", "Hold"],
+            ["1", "0", "1", "0", "Set"],
+            ["0", "1", "0", "1", "Reset"],
+            ["1", "1", "X", "X", "Invalid"],
+        ],
+        headers=["S", "R", "Q", "Q'", "State"],
+        interactive=False,
+    )
+
+    gr.Markdown("### History")
+    history_box = gr.Textbox(label="Log", lines=8, interactive=False)
+
+    reset_btn = gr.Button("Reset latch")
+
+    apply_btn.click(
+        fn=sr_latch,
+        inputs=[s_input, r_input],
+        outputs=[q_output, q_bar_output, state_output, history_box],
+    )
+
+    reset_btn.click(
+        fn=reset_latch,
+        inputs=[],
+        outputs=[q_output, q_bar_output, state_output, history_box],
+    )
+
+if __name__ == "__main__":
+    demo.launch()